Black TENGU EXPOSED: .TENGU Files, _README_TENGU.txt, and tengulocker@cyberfear.com
Written by: Lapain Epuran
Published on:
You open Documents the way you did yesterday. The first photo should still be 1.jpg. The second still 2.png. The invoice should still be invoice-2026.pdf. The tax sheet should still be taxes.xlsx. Instead every familiar name has a second ending tacked on. 1.jpg is now 1.jpg.TENGU. 2.png is now 2.png.TENGU. A small text file named _README_TENGU.txt is sitting in the same folder, as if it has always belonged there.
That is the trap, not a glitch.
This page is for the hour those names appear. It is not a miracle key. It is a map of the trap, so the note does not become your incident plan. The locker on this disk is Black TENGU ransomware. It is not an unrelated Tengu brand, a restaurant, a gadget, or a folklore mascot. Name the locker. Leave the rest alone.
Encrypted files after Black TENGU. The .TENGU names and _README_TENGU.txt are the tell.
Overview
Black TENGU ransomware locks the files first. Then it keeps the old name and the old type, and hangs .TENGU on the end. Then it drops _README_TENGU.txt and talks like a recovery desk that also stole a copy of the house. The note is a storefront. It shouts that all your important files are stolen and encrypted by Black TENGU. It tells you to mail tengulocker@cyberfear.com or tengunlocker@onionmail.com. It claims a leak. It leaves the victim ID, the Tor chat, the token ID, the blog, and the TOX fields blank. This page will not invent those strings.
If you are staring at a pile of .TENGU files and that text note, you are in a ransom incident, not a broken disk and not a Windows pop-up. The folder is the evidence. The note is a checkout. Stay with the folder, not with the script.
The first tell is the rename. In documented copies, 1.jpg becomes 1.jpg.TENGU. 2.png becomes 2.png.TENGU. The same extra ending lands on the rest of the pile. vacation.jpg becomes vacation.jpg.TENGU. invoice-2026.pdf becomes invoice-2026.pdf.TENGU. taxes.xlsx becomes taxes.xlsx.TENGU. family.mp4 becomes family.mp4.TENGU. You can still read what the file used to be. You cannot open it. Windows may call the type a TENGU File and offer a useless “choose an app” box. An app cannot talk locked bytes back into a JPEG.
The second tell is the note. After the files are locked, the malware drops _README_TENGU.txt into the same folders. README sounds like documentation. TENGU sounds like a brand. Put them together and the first English you can still read after the photos break is a sales flyer. The flyer is meant to be opened. It is not meant to be trusted.
The body of that sample is loud on purpose. ALL YOUR IMPORTANT FILES ARE STOLEN AND ENCRYPTED By Black TENGU. Then a breach story. Then a copy story. Then a lock story. Then a promise that unlocking software will restore the network in less than 1-5 hours after you pay. Then a promise they will not attack again and will delete your data from their servers. Then two next steps: do not try to decrypt the files yourself, and send mail to tengulocker@cyberfear.com or tengunlocker@onionmail.com. Then a row of blanks. Your ID is blank. The Tor chat line is blank. The token ID is blank. The blog line is blank. Support TOX Chat is blank. Those blanks are not puzzles. This page will not fill them.
That is the whole pitch. A locked folder of .TENGU names. A _README_TENGU.txt file that talks like a recovery brief and a leak threat at the same time. Two inboxes. A restore promise measured in hours, not a printed countdown. Empty ID, chat, token, blog, and TOX fields. No printed wallet. No printed victim bill. There is no public free decryptor known for this strain. There is no reason to mail those inboxes today because a text file told you to.
The .TENGU name is the first warning
Most lockers pick an extension so you notice the change in seconds. Black TENGU uses .TENGU. The extra cruelty is how readable the listing stays. You do not have to decode anything. You can still see 1.jpg inside 1.jpg.TENGU. You can still see 2.png inside 2.png.TENGU. You can still see the invoice year. You can still see the word taxes. The familiar words are still in the folder. The files are not familiar anymore.
Do not treat that readable name as a fix. Do not strip .TENGU off the end and expect Photos or Excel to open the file. Do not run a bulk “extension fixer” you found in an ad. The name is a label. The lock is in the content. Editing the label can make a later trusted tool have a harder time matching the file to what it was. Leave the locked copies as they are until you have a clean machine and a plan that does not start in a criminal inbox.
The extra ending also does advertising. Anyone who sees vacation.jpg.TENGU next to _README_TENGU.txt can pretend they already have your case. A later fake helper will quote the extension back to you as if that were expertise. The extension is public. It is sitting in the folder. Quoting it proves nothing except that they can read a listing.
_README_TENGU.txt is a sales floor, not a help file
The ransom note is a plain text file with a name that sounds like documentation. _README_TENGU.txt wants the first click after the panic. Plenty of real software drops a readme. This one uses that habit against you. It is meant to be the first English you can still read when the photos will not open.
Double-clicking it opens Notepad. That is why a panicked first click feels like opening the help page. It is not help. It is the demand, written so it looks official enough to follow. The filename is built to look like paperwork. README. TENGU. A .txt ending Windows already trusts. The leading underscore even helps it sort near the top of some listings. Paperwork is easier to obey than a threat.
Keep the file on disk. Then close it. Do not treat it as a set of steps you should follow. Do not tidy the filename. Do not shorten it to “the readme” when you write the incident down. Copy _README_TENGU.txt the way you would copy a serial off a stolen laptop. That string is how a responder matches this locker. It is not a coupon you redeem by mailing tengulocker@cyberfear.com or tengunlocker@onionmail.com.
STOLEN AND ENCRYPTED is a shout, not a lab report
The first line of the sample is not a diagnosis. It is a headline. ALL YOUR IMPORTANT FILES ARE STOLEN AND ENCRYPTED By Black TENGU does the same job a fake breaking-news banner does on a supplement page. It names the disaster in capital letters so the rest of the flyer feels like the only adult in the room. You are supposed to stop thinking and start obeying.
The shout is also a brand. Later search ads will quote it. Later “helpers” will paste it so they sound close to your folder. Anyone can copy a headline. Copying ALL YOUR IMPORTANT FILES ARE STOLEN AND ENCRYPTED By Black TENGU does not mean they can reverse .TENGU. It means they read the same note you did, or they read a screenshot of it.
If the shout is sitting in more than one folder, that is normal for this family. Lockers drop the same text in many places so you cannot miss it. Finding five copies is not five incidents. It is one incident with a loud flyer. Keep one clean copy as evidence. You do not need to open every copy. You do not need to compare them in mail to tengulocker@cyberfear.com.
The stolen-data claim is a second bill
The note does not only say the files are locked. It says the operators breached the network, copied confidential data, and uploaded that copy to a private storage device. Then it sells two products at once. Decrypt the files. Delete the stolen copy. Pay the costs of the data breach and decryption, it says, and they will permanently delete your data from their servers. That is dual extortion copy. It is still a sales paragraph.
A leak claim is meant to close the last excuse. If the photos are locked, maybe you had a backup. If the photos were also copied, the backup does not save the privacy problem. That is the squeeze. It is also unproven from the text file alone. A flyer can say “we uploaded everything” whether they did or not. Do not mail them a folder listing to “confirm what they have.” Do not send a sample file so they can “prove the leak.” Proof is their product. You do not buy it.
The same sample leaves the Blog field blank. It talks like there is a leak site. It does not print one. This page will not invent an onion address, a leak-blog URL, or a victim dollar figure to finish that sentence. A blank blog line is not a scavenger hunt. If a later helper offers “the real Black TENGU leak site,” they are filling a field the sample left empty. Do not help them.
tengulocker@cyberfear.com is checkout, not support
The first printed contact is tengulocker@cyberfear.com. That is the aisle. A private inbox puts you in a room they own, on an account they can delete, with a thread they can screenshot and reuse. Email would feel like a ticket. This email is not a ticket. It is how a locked photo becomes a negotiation.
Do not open a fresh mail account because the note said to. Do not send a test file to prove you are a real victim. Do not paste a folder listing into a new message. Do not ask what “the costs of the data breach and decryption” are, as if a quote were a repair. That address belongs to the people who locked the files. Writing it is the product.
The handle is branding, the same way .TENGU is branding. Anyone can stand up a lookalike inbox after a wave of locked folders. Writing the first message does not start a warranty. It starts a conversation you cannot enforce. The stolen-data line is how they make that first message feel urgent even if you have backups. Urgency is not a decryptor.
tengunlocker@onionmail.com is the same shop
The second printed contact is tengunlocker@onionmail.com. Read it twice. The first inbox is tengulocker. The second is tengunlocker. One letter is not a second crew. It is a spare door on the same storefront, in case the first mailbox is blocked, full, or burned. A spare door is still their door.
Do not “try the other one” if the first bounce. Do not treat onionmail as a safer channel because the name sounds like Tor. Do not split the incident into two tickets. Both addresses are printed on the same flyer, in the same sentence, as the same next step. Mail to either one is still contact with the people who locked 1.jpg.TENGU.
Copycats love a second inbox. They will tell you the cyberfear address is dead and the onionmail one is “the real operator.” They will tell you the opposite. They will invent a third. The sample names two strings and only those two. tengulocker@cyberfear.com and tengunlocker@onionmail.com. Do not add a third. Do not write either one.
After the mail step, the sample offers an “or” path that looks like a portal. Download the Tor Browser from the official Tor Project download page. Visit the chat. Use this token ID to log in. Then a blog line. Then Support TOX Chat. On the sample used for this page, those fields are blank. Your ID is blank. The chat line is blank. The token ID is blank. The blog line is blank. TOX is blank. This page will not invent a victim ID, a chat onion, a token, a leak blog, or a TOX handle to make the flyer look finished.
Blank fields are a feature. They let the next person fill them. A later message can paste an onion and call it “your Black TENGU chat.” A later page can paste a token and call it “your login.” A later broker can paste a TOX ID and call it “direct support.” None of that was on the sample. Filling a blank is how a second scam stands in the first scam’s doorway.
If your own copy of _README_TENGU.txt still shows dashes or empty lines in those spots, leave them. Do not type random characters “to see if the form accepts them.” Do not download Tor because a ransom note named the Tor Project. The official Tor Browser page is a real project. Using it to walk into a blank criminal chat is still walking into their room. Keep the blank note as evidence. Do not complete it.
1-5 hours is a restore promise, not a countdown
The sample does not print a 24-hour fuse. It does not print a 48-hour key deletion. It does not print “pay before midnight or the files are gone.” What it prints is a different hour line. The unlocking software will fully restore your network in less than 1-5 hours. That is a sales promise about speed after payment. It is not a printed countdown. Do not treat it as one.
Speed copy is there to make waiting feel stupid. If restore only takes a few hours, why would you sleep on it. That is the trick. A restore promise is not a restore. It does not prove they have a key. It does not prove the key works on family.mp4.TENGU. It does not prove they will send anything after you pay. Hours on a flyer are still a flyer.
Do not invent a deadline because other ransomware families use one. Do not start a personal timer because a comment said “they only wait two days.” The published note has no printed hour countdown. Leave the fuse uninvented. The 1-5 hours line is about their imaginary software, not about your clock.
Black TENGU is the locker, not an unrelated Tengu brand
Tengu is a word with a life outside this incident. Japanese folklore uses it. Unrelated companies use it on restaurants, tools, games, and shirts. None of that is this malware. The locker on the disk is Black TENGU ransomware, the strain that appends .TENGU and drops _README_TENGU.txt, and that points victims at tengulocker@cyberfear.com and tengunlocker@onionmail.com.
Do not smear those other brands. Do not call a restaurant a ransomware gang because the names overlap. Do not file a rage review on a gadget maker. Do not hunt a folklore page as if it were a leak blog. Name the locker. If the folder shows 1.jpg.TENGU and _README_TENGU.txt, you are looking at this filecoder, not at a product catalog.
Copycats will blur that line on purpose. A later fake helper will say “Tengu support” as if a real company ran a helpdesk for locked photos. A later ad will use the folklore bird as a logo. The artifacts on disk are the name. Extension. Note. Two inboxes. Stay with those. Leave unrelated Tengu names out of the incident record.
Babyk.A is a family tag, not a key
Public scanners have labeled copies of this locker Win32/Filecoder.Babyk.A. That is ESET’s name for the Babuk family, which they spell Babyk. Microsoft has used Trojan:Win32/Babuk!ic on copies. A family tag is useful for a responder. It is not a decryptor. It does not put a key on your desk. It does not mean a public tool already exists for .TENGU.
Babuk-family code has shown up under many names. Sharing a family does not mean last year’s decryptor will open this year’s files. Do not run a random “Babuk decryptor” you found in an ad against invoice-2026.pdf.TENGU. Do not send a sample to a stranger because they recited Babyk.A. Reciting a detection name is not proof they can reverse the lock. It is proof they can read a scan report.
There is no public free decryptor known for this strain. Until a trusted project publishes one that names Black TENGU or this exact extension, treat any site that says “we already have the TENGU key” as a second sales pitch. A family tag can wait for a clean machine and a real incident lead. It cannot be cashed in at tengulocker@cyberfear.com.
How The Attack Works
The shop is simple once you stop reading it as a rescue. Lock the files. Brand the names with .TENGU. Drop a readme that shouts STOLEN AND ENCRYPTED. Claim a copy of the data. Point the scared person at tengulocker@cyberfear.com and tengunlocker@onionmail.com. Promise a 1-5 hour restore. Warn them not to decrypt themselves. Leave the ID, chat, token, blog, and TOX lines blank. Then wait for someone else to sell the missing strings.
1. The lock keeps the old name so you recognize the loss
Black TENGU encrypts the files it wants as leverage, then appends .TENGU. That is why 1.jpg is still readable as 1.jpg.TENGU, and why 2.png is still readable as 2.png.TENGU. The operators want you to inventory the damage in seconds. They want you to see the vacation photo, the invoice, the tax sheet, and the family video in one glance. A coded filename can confuse you. A readable filename makes you feel the theft.
If only one folder looks wrong, do not assume the rest of the disk is safe. Ransomware walks trees. It hits Documents, Desktop, Pictures, Downloads, and any drive letter it can reach, including a USB stick you forgot was plugged in. Unplug extra disks. Do not plug in a copy “just to check.” Checking is how the extra copy gets the same .TENGU ending.
Double-clicking a renamed file does not bring the photo back. The thumbnail may already look broken. Excel may ask for a workbook that is still sitting in the same folder, only the bytes inside are no longer a workbook. That broken open is the first proof. The second proof is the extra ending. Together they are enough. You do not need to mail tengulocker@cyberfear.com to confirm what you are looking at.
2. _README_TENGU.txt turns a break-in into a ticket
Once the names are branded, the malware needs a voice. _README_TENGU.txt is that voice. It sits in the same folders as the locked files so the first sort puts help next to harm. On many machines a text file with a leading underscore and a name in capitals sorts near the top. You open it because it looks like the only thing that still speaks English.
The body is short enough to finish before a relative walks into the room. Stolen. Encrypted. Breach. Copy. Lock. Do not worry. We can decrypt. Restore in 1-5 hours. Pay. We will not attack again. We will delete the data. Do not decrypt yourself. Mail these two inboxes. Each beat closes a door. The shout closes “maybe Windows just glitched.” The stolen-data line closes “maybe a backup is enough.” The inbox pair closes “maybe there is a local tool.” The blanks close nothing, which is the point. They leave room for the next person to sell a chat.
Notice what the note does not give you. It does not give you a company, a refund policy, or a way to prove the other side will ever send a key. It does not give you a printed countdown. It does not give you a test decrypt. It does not give you a filled unique ID. It does not give you a wallet. It does not give you a victim bill. It gives you a tone that says this is already decided. That tone is the product. Read the file as a sales flyer. Then close it. Keep it on disk.
3. STOLEN AND ENCRYPTED is the opening shout
The first line of the sample is a headline, not a technician. ALL YOUR IMPORTANT FILES ARE STOLEN AND ENCRYPTED By Black TENGU names the disaster, the theft, and the brand in one breath. You are supposed to feel outmatched before you have even reached the contact line. Capital letters do that work. The word stolen does that work. Together they make the inbox feel like the only adult move left.
The shout also travels. Search ads will recycle it. Commenters will paste it. A later “Black TENGU helper” will recite it so they sound close to your Documents folder. Reciting a headline is not a decryptor. It is proof they can read. Keep the line as an identifier when you describe the incident. Do not treat it as a diagnosis you have to obey.
4. Dual extortion without a filled leak blog
After the shout, the note rests on a story. We breached your network. We copied your confidential data. We uploaded it to a private storage device. We encrypted your files. That sequence is meant to end the conversation you have not even started. Lock plus leak sounds like two disasters you cannot beat at the kitchen table. It is still a sales paragraph. It is not a lab report. It is not a screenshot of their storage. It is not a reason to skip copies that were never mounted.
You do not need to argue forensics with a text file. You need to stop treating the file as a technician. Leave 1.jpg.TENGU named as it is. Leave _README_TENGU.txt where it is. The leak claim printed in that note is part of the pitch. It is not a recovery procedure. The Blog field on the same sample is blank. Do not invent a leak site because the story sounds like one should exist.
5. Two inboxes are one door
The recovery step in the sample is mail. Send an e-mail message to tengulocker@cyberfear.com or tengunlocker@onionmail.com. That is the whole door, printed twice. It looks like support because support uses email. Criminal shops use email too, because a thread is where a price becomes a negotiation and a locked photo becomes a sample they asked you to attach.
Do not write those inboxes. Do not create a throwaway account “just to see.” Do not send a screenshot of Explorer to prove the lock. They already chose the extension. They already chose the note name. A photo of _README_TENGU.txt sitting next to 1.jpg.TENGU does not make you a verified customer. It makes you a person still following the flyer.
If someone later says they will “talk to Black TENGU for you” through those same addresses, that is a broker pitch. Brokers need you in the same funnel. You do not owe them a seat. Report the incident through official desks. Let counsel decide if contact is ever required for a specific legal reason. That decision is not yours to make from the Documents folder at midnight.
6. Blank fields are not a scavenger hunt
The sample prints an or-path that looks like a portal and then leaves it empty. Your ID: blank. Visit the chat: blank. Token ID: blank. Blog: blank. Support TOX Chat: blank. Public writeups of this locker should leave those fields blank too. This page will not mint a victim token. It will not guess an onion. It will not invent a Session handle, a TOX ID, or a wallet to sit next to the mail step.
That gap is where copycats work. Someone will publish a long onion and call it the Black TENGU chat. Someone will sell a “connector” that is just more malware. Someone will ask you to run a command so they can “reach the operator on your behalf.” None of that is a reason to finish their sentence. The sample used for this page does not reprint those strings. Do not invent them.
A filled ID, when you actually have one on a different strain, is an identifier for a responder. On this sample you do not. The blank is the identifier. Copy the note into the incident record. Then leave the blanks alone. Do not mail tengunlocker@onionmail.com to ask them to “issue your token.”
7. Do not decrypt yourself is how they keep you in the aisle
The first numbered next step in the sample is a warning. Do not attempt to decrypt the files yourself. You may cause permanent data loss. That line has a grain of truth and a pile of sales. Yes, random decrypt tools and bulk renames can damage locked files. No, that fact does not make their inbox the only adult in the room. It makes amateur tools a bad idea. It does not make criminals a good idea.
The warning is also a fence. If you are scared to touch the files, you are more likely to write. If you are scared to wait for a trusted project, you are more likely to pay. Keep the warning, but point it at the right target. Do not feed taxes.xlsx.TENGU to a mystery app that asked for admin rights. Do not strip the ending in bulk. Do not mail the files to tengulocker@cyberfear.com either. Leaving the locked copies alone is the safe version of their advice. Their inbox is not.
8. 1-5 hours is theater about speed
Plenty of lockers hide the timeline until you write. This one prints a restore window up front. Less than 1-5 hours, it says, and the unlocking software will fully restore your network. That is not kindness. A printed speed removes the last excuse for delay. You do not have to “ask how long recovery takes.” You already know the sales answer. The remaining step, in their script, is the mail and the payment.
Hours also travel well. A 1-5 hour restore is easy to repeat in a family group, easy to treat like a same-day repair, easy to round into “maybe we can just get this over with.” It is still a promise from the people who locked family.mp4.TENGU. It still does not produce a warranty. Fast is how they get people who think of themselves as too careful to sit in a week-long negotiation.
Do not convert 1-5 hours in your head into a plan for tonight. The number is theirs. The files are already locked. Another afternoon of panic will not change the bytes in vacation.jpg.TENGU. And do not confuse that restore promise with a countdown. The sample does not print one.
9. Third parties will sell a Black TENGU conversation
After a ransomware incident, search results fill up with companies that say they can decrypt Black TENGU or “all .TENGU files.” Some of those shops are ordinary overpriced consultants. Plenty are a second scam. They will quote _README_TENGU.txt so they sound close to the case. They will mention STOLEN AND ENCRYPTED. They will mention 1-5 hours. They will mention tengulocker@cyberfear.com as if they already called the original crew. They will ask for a sample file, a remote-access session, or a deposit.
A demo that “unlocks one file” is not proof they can unlock the vacation photo. Anyone can open one junk file they control. Anyone can send you a chat onion that makes a Tor window appear. A Tor window is not Photos opening vacation.jpg again. If a later message skips the original inboxes and asks for coin over ordinary mail, that is still the same market, or a copycat standing in the same doorway. Do not answer. Do not help them fill the blank blog, the blank token, or a wallet the sample never printed.
A real public decryptor, when one exists, shows up on an official project page that already existed before your incident. It does not need a ransom send. It does not need tengulocker@cyberfear.com or tengunlocker@onionmail.com. If the pitch is “we can decrypt, pay us first,” you are still in the market the ransomware created. There is no public free decryptor known for this strain. Until a trusted project publishes one, treat any site that says “we already have the TENGU key” as a second sales pitch.
10. Payment and mailing those inboxes close nothing
Paying a stranger for a private key is not a guarantee. The people who send the note can take the money and disappear. They can send a string that only makes a decryptor show an error. They can come back later and lock the same machine again. They can publish the stolen copy anyway. A mail thread makes that outcome easier, not harder. You cannot leave a review on a criminal inbox. The CISA StopRansomware Guide is blunt about this kind of squeeze. Paying does not ensure the files come back, does not ensure the systems are clean, and does not ensure anyone on the other side keeps a promise.
Mailing tengulocker@cyberfear.com or tengunlocker@onionmail.com is the free version of the same dead end. There is no public free decryptor known for this strain. Starting a thread does not rebuild a JPEG. It only keeps you in their story while the rest of the disk still needs a real plan. The note already did the quoting. Your job, in their script, is checkout. Do not complete it. Do not “test” a smaller amount to see if they answer. A test payment is still a payment. It still tells them this victim pays.
If this is a company machine, tell counsel and your incident lead. If this is a home PC, tell the people whose files lived on it. Change passwords from a clean device. Watch bank and email alerts. Opening those inboxes again is not useful work. It is the checkout, even when the chat, the token, the blog, and the TOX lines in the public copy are blank.
What To Do
Do not pay. Do not mail tengulocker@cyberfear.com. Do not mail tengunlocker@onionmail.com. Do not invent a wallet, a Session handle, an onion chat, a token ID, or a victim bill to finish _README_TENGU.txt. Do not type a string from a later helper into an exchange, a “wallet checker,” or a form a stranger sends back. Do not send proof of payment. Do not send a test file. If you already sent a message before you found this page, stop there. Do not pay a deposit to “hold the original deal” for anyone who quotes the note.
STEP 1: Use Rkill to terminate suspicious programs.
In this first step, we will download and run Rkill to terminate suspicious programs that may be running on your computer.
RKill is a program that was developed at BleepingComputer.com that attempts to terminate known malware processes so that your normal security software can then run and clean your computer of infections. When RKill runs it will kill malware processes and then removes incorrect executable associations and fixes policies that stop us from using certain tools.
Download Rkill.
You can download RKill to your computer from the below link. When at the download page, click on the Download Now button labeled iExplore.exe. We are downloading a renamed version of Rkill (iExplore.exe) because some malware will not allow processes to run unless they have a certain filename.
RKILL DOWNLOAD LINK (The above link will open a new page from where you can download Rkill)
Run RKill.
After downloading, double-click the iExplore.exe icon to kill malicious processes. In most cases, downloaded files are saved to the Downloads folder. The program may take some time to search for and end various malware programs.
When it is finished, the black window will close automatically and a log file will open. Do not restart your computer. Proceed to the next step in this guide.
STEP 2: Use Malwarebytes to remove Ransomware and Unwanted Programs
In this second step, we will install Malwarebytes to scan and remove any infections, adware, or potentially unwanted programs that may be present on your computer.
Malwarebytes is one of the most popular and trusted anti-malware tools for Windows — and it’s completely free for removing infections. It catches threats that many antivirus programs miss, including adware, browser hijackers, and trojans. Follow the steps below to scan and clean your PC in just a few minutes.
Download Malwarebytes
Click the button below to download the latest version of Malwarebytes for Windows from the official source. The free version is all you need — it will scan your computer and remove adware, browser hijackers, and other malicious software at no cost.
(The link opens in a new page where your download will start)
Install Malwarebytes
When the download finishes, open your Downloads folder and double-click the MBSetup file. If Windows shows a User Account Control pop-up, click “Yes” to allow the installation.
Follow the On-Screen Prompts to Install Malwarebytes
The setup wizard will walk you through a few quick screens:
Choose where you’re installing the program — “Personal Computer” or “Work Computer” — then click Next.
Malwarebytes will now install on your device. This usually takes under a minute.
When installation is complete, the “Welcome to Malwarebytes” screen will open automatically.
On the final screen, click Open Malwarebytes to launch the program.
Enable “Scan for Rootkits”
Before scanning, turn on rootkit detection so Malwarebytes can find even the most hidden threats. Click the Settings gear icon on the left side of the screen.
In the settings menu, find “Scan for rootkits” and click the toggle so it turns blue.
Done? Click “Dashboard” in the left pane to return to the main screen.
Start the Scan
Click the blue Scan button. Malwarebytes will automatically update its virus database and start checking your computer for malware.
Wait for the Scan to Finish
The scan checks your entire system for browser hijackers and other malicious programs, so it can take several minutes. Feel free to do something else — just check back occasionally to see the progress.
Quarantine the Detected Threats
When the scan is done, you’ll see a list of everything Malwarebytes found — malware, adware, and potentially unwanted programs. Click the “Quarantine” button to remove all of them at once.
Malwarebytes will now remove the malicious files and registry entries and move them safely into quarantine.
Restart Your Computer
Some threats can only be fully removed after a reboot. If Malwarebytes asks you to restart, click Yes. Once you’re logged back in, your PC is clean and you can continue with the next steps in this guide.
STEP 3: Use HitmanPro to remove Rootkits and other Malware
In this third step, while the computer is in normal back, we will download and run a scan with HitmanPro to remove Trojans, rootkits, and other malicious programs.
HitmanPro is a second-opinion scanner — it’s designed to catch what your main antivirus might have missed. Instead of relying on a single detection engine, it checks the behavior of files in the locations where malware usually hides. Anything suspicious gets sent to the cloud, where it’s analyzed by two of the best antivirus engines available: Bitdefender and Kaspersky.
Good news: scanning is completely free, with no limits. You only need a license when it’s time to remove what was found — and even then, you can activate a free one-time 30-day trial to clean your PC at no cost. (A full license is $24.95 per year for 1 PC.)
Download HitmanPro
Click the button below to download HitmanPro. Remember — the scan is free, so you have nothing to lose by checking your PC.
When the download finishes, open your Downloads folder and double-click the file: “hitmanpro.exe” on 32-bit Windows, or “hitmanpro_x64.exe” on 64-bit Windows.
If a User Account Control pop-up asks whether HitmanPro can make changes to your device, click “Yes” to continue.
Follow the On-Screen Prompts
On the HitmanPro start screen, click “Next” to begin the system scan. No lengthy setup required — it goes straight to work.
Wait for the Scan to Finish
HitmanPro will now check your computer for malicious programs. This usually takes just a few minutes thanks to its cloud-based scanning.
Review the Results and Click “Next”
When the scan is done, HitmanPro will show you everything it found. Click “Next” to remove the detected threats.
Click “Activate Free License”
To remove the malicious files, click the “Activate free license” button. This starts your free 30-day trial — no payment details needed — and unlocks the full cleanup.
When the removal is complete, HitmanPro will show a summary of everything it cleaned. Click Next, then click Reboot if prompted. If there’s no reboot prompt, just click Close — your PC is clean.
STEP 4: Use AdwCleaner to remove Malicious Browser Extensions and Adware
In this next step, we will use AdwCleaner to remove malicious browser policies and unwanted browser extensions from your computer.
AdwCleaner is a free on-demand scanner that specializes in adware, browser hijackers, and unwanted toolbars — the exact threats that mainstream antivirus programs often miss. It also includes tools that repair the damage malware leaves behind, like hijacked browser settings and malicious policies. It’s a quick scan that’s well worth running.
Download AdwCleaner
Click the button below to download AdwCleaner — it’s free, portable, and requires no installation.
Open your Downloads folder and double-click the file named “adwcleaner_x.x.x.exe“. There’s no installation — the program starts right away.
If Windows asks whether you want to allow AdwCleaner to run, click “Yes“. When the license agreement appears, click I agree to continue.
Enable “Reset Chrome policies”
This setting removes malicious browser policies — a trick malware uses to lock your browser settings so you can’t change them back. Click “Settings” on the left side of the window, then turn on “Reset Chrome policies“.
Start the Scan
Click “Dashboard” on the left side of the window, then click the “Scan” button.
Wait for the Scan to Finish
AdwCleaner will now check your computer for adware and other malware. This usually takes only a few minutes — it’s one of the fastest scanners around.
Quarantine the Detected Threats
When the scan finishes, AdwCleaner will list everything it found. Click the “Quarantine” button to remove all the malicious items at once.
Click “Continue” to Finish the Cleanup
Save any open work first — AdwCleaner needs to close your open programs before it can clean. When you’re ready, click the “Continue” button.
AdwCleaner will now delete all detected malware from your computer. If it asks you to restart your PC, allow it — your computer will be clean when you log back in.
STEP 5: Perform a final check with ESET Online Scanner
This final step involves installing and running a scan with ESET Online Scanner to check for any additional malicious programs that may be installed on the computer..
ESET Online Scanner is a free second-opinion scanner that performs a deep, full-system check for viruses, trojans, rootkits, and other malware. We use it as the final step because it’s thorough — if anything slipped past the previous scans, ESET will find it. A clean result here means your computer is malware-free.
Download ESET Online Scanner
Click the button below to download ESET Online Scanner.
When the download finishes, open your Downloads folder and double-click “esetonlinescanner.exe“.
Install ESET Online Scanner
On the start screen, select your language from the drop-down menu and click Get started.
On the Terms of use screen, click Accept.
Choose your preferences for the Customer Experience Improvement Program and the Detection feedback system (either choice is fine), then click Continue.
Start a Full Scan
Click Full Scan — this checks your entire computer, not just the common hiding spots.
Select Enable for Detection of Potentially Unwanted Applications — this lets ESET catch adware and bundled junk programs, not just viruses. Then click Start scan.
Wait for the Scan to Finish
ESET will now check every file on your computer. Because it’s a full scan, this can take a while — often an hour or more, depending on how much data you have. Leave it running in the background and check on it from time to time.
Review the Results
When the scan completes, the Found and resolved detections screen appears. Any threats found were automatically cleaned and quarantined — there’s nothing extra you need to do. Click View detailed results if you want to see exactly what was removed.
If ESET found nothing — congratulations, your computer has passed the final check and is malware-free.
STEP 6: Restore the files encrypted by ransomware
Unfortunately, in most cases, it’s not possible to recover the files encrypted by this ransomware virus because the private key which is needed to unlock the encrypted files is only available through the attackers. However, below we’ve listed three options you can use to try and recover your files.
Make sure you remove the malware from your computer first, otherwise, it will repeatedly lock your system or encrypt files. If you suspect that your computer is still infected with malware, you can run a free scan with Emsisoft Emergency Kit.
Option 1: Search a decryption tool for this ransomware
The cybersecurity community is constantly working to create ransomware decryption tools, so you can try to search these sites for updates:
Option 2: Use EaseUS Data Recovery Wizard Free to recover the encrypted files
EaseUS Data Recovery Wizard Free can restore files and repair corrupted files with simple clicks. Its powerful scanning algorithms can identify and retrieve huge file type library, including all of the popular video files, audio files, photos, and document formats. While the free version only allows you to recover 2 GB of data, this can be helpful to see if the recovery is possible and restore back the most important files from your computer.
Download EaseUS Data Recovery Wizard Free.
You can download EaseUS Data Recovery Wizard Free by clicking the link below.
Double-click on the EaseUS Data Recovery Wizard Free setup file.
When EaseUS Data Recovery Wizard Free has finished downloading, double-click on the setup file to install EaseUS Data Recovery Wizard on your computer. In most cases, downloaded files are saved to the Downloads folder.
You may be presented with a User Account Control pop-up asking if you want to allow EaseUS to make changes to your device. If this happens, you should click “Yes” to continue with the EaseUS Data Recovery Wizard Free installation.
Follow the on-screen prompts to install EaseUS Data Recovery Wizard.
When the EaseUS Data Recovery Wizard installation begins, click on the “Install Now” as seen in the image below.
When your EaseUS Data Recovery Wizard installation completes, click the “Start Now” button to start the program.
Select a location to start recovering the encrypted files.
Choose the drive or folder where you are the encrypted files that you want to recover and click “Scan“.
Wait for the EaseUS Data Recovery Wizard scan to complete.
EaseUS Data Recovery Wizard will now scan your computer files that can be restored. This process can take a few minutes, so we suggest you do something else and periodically check on the status of the scan to see when it is finished.
Find the files you want to recover.
When the EaseUS Data Recovery Wizard scan is finished scanning it will show a screen that displays the files that can be recovered. This tool can recover a lot of data, use the “Filter” button to quickly filter specific file types and find the files that you want to recover.
Click the “Preview” button or double-click on a file for a full preview.
Select your files and click “Recover”.
Finally, select the the files you want to recover and click “Recover“. Choose a safe location to save all the files. The free version only allow you to recover 2 GB of data, however, this will allow you to recover the most important files and see if EaseUS Data Recovery Wizard can correctly recover them.
Option 3: Try to restore your files with ShadowExplorer
This ransomware will attempt to delete all shadow copies when you first start any executable on your computer after becoming infected. Thankfully, the infection is not always able to remove the shadow copies, so you should continue to try restoring your files using this method.
Download ShadowExplorer.
You can download ShadowExplorer from the below link.
Double-click on the ShadowExplorer-x.x-setup file to start the installation process, then follow the on-screen promts to install this program.
Select snapshot date.
Open ShadowExplorer and then from the top bar select the drive where the files that you want to save are located, then select from the snapshot available one previous to this infection.
Export the files that you want to recover.
Once you have found a copy of the original file or folder, right-click on it and the select “Export”. A window will prompt you where you want to save the file or folder.
Keep every .TENGU name exactly as it is. Do not bulk-rename 1.jpg.TENGU back to 1.jpg, or 2.png.TENGU back to 2.png, or invoice-2026.pdf.TENGU back to a normal PDF, or taxes.xlsx.TENGU back to a spreadsheet, or family.mp4.TENGU back to a video. Stripping the extra ending is not a repair. It can make a later trusted tool worse, not better. The original name is already sitting in front of .TENGU. You do not need to edit it to know what you lost.
Keep _README_TENGU.txt with the locked files, and keep at least one .TENGU sample next to it. Do not “clean up” every copy of the note. Do not fill in a chat URL, a token, a blog, or a TOX ID so the flyer looks complete. The blanks, or the strings on your disk, are part of how you prove this was this strain and not a different locker that only sounds similar. Keep the contact marks as identifiers: tengulocker@cyberfear.com, tengunlocker@onionmail.com, the STOLEN AND ENCRYPTED line, and the 1-5 hour restore promise. Those artifacts are evidence. They are not instructions you should carry out.
Do not pay. Do not mail those inboxes. Do not ask a friend to write them “just to see.” A calm address is still the people who locked the files. If a later message quotes _README_TENGU.txt and offers “the real chat” or “the real token,” that is still the same shop. If a later message skips the original inboxes and asks for coin over a different address, that is still the same shop, or a copycat standing in the same doorway.
If someone claims they can already decrypt Black TENGU files for a fee because they can recite Babyk.A and 1-5 hours, they are selling a report, not a key. If they mention tengulocker@cyberfear.com as proof they “already called the crew,” they read the same note you did. Do not answer. Do not complete their checkout. Do not help them fix the flyer.
If Windows still offers to pick an app for the .TENGU type, decline it. There is no player for that ending.
The Bottom Line
Black TENGU ransomware is a locker with a readable filename, a readme that shouts STOLEN AND ENCRYPTED, and a checkout that names two inboxes. It keeps the old name and appends .TENGU. 1.jpg becomes 1.jpg.TENGU. 2.png becomes 2.png.TENGU. The note is _README_TENGU.txt. It claims a data theft and a leak, points you at tengulocker@cyberfear.com and tengunlocker@onionmail.com, and promises a 1-5 hour restore after you pay. The victim ID, Tor chat, token ID, blog, and TOX fields are blank on the sample, and this page will not invent them. There is no printed hour countdown. There is no printed wallet. There is no public free decryptor known for this strain. Copies sit in the Babuk family, detected as Win32/Filecoder.Babyk.A. Unrelated Tengu brands are not this locker. Name the locker.
Do not pay. Do not mail those inboxes. Do not invent a wallet, an onion, a token, or a victim bill. Do not rename the pile in bulk. If you take one sentence with you, take this. A folder of names ending in .TENGU, plus _README_TENGU.txt with a STOLEN AND ENCRYPTED shout and tengulocker@cyberfear.com beside tengunlocker@onionmail.com, is ransomware on the first sighting. Treat it that way before anyone offers to fill the blank chat line.
10 Rules to Avoid Online Scams
Here are 10 practical safety rules to help you avoid malware, online shopping scams, crypto scams, and other online fraud. Each tip includes a quick “if you already got hit” action.
Stop and verify before you click, log in, download, or pay.
Most scams win by creating urgency. Verify using a trusted method: type the website address yourself, use the official app, or call a known number (not the one in the message).
If you already clicked: close the page, do not enter passwords, and run a malware scan.
Keep your operating system, browser, and apps updated.
Updates patch security holes used by malware and malicious ads. Turn on automatic updates where possible.
If you saw a scary “update now” pop-up: close it and update only through your device settings or the official app store.
Use layered protection: antivirus plus an ad blocker.
Antivirus helps block malware. An ad blocker reduces scam redirects, phishing pages, and malvertising.
If your browser is acting weird: remove unknown extensions, reset the browser, then run a full scan.
Install apps, software, and extensions only from official sources.
Avoid cracked software, “keygens,” and random downloads. During installs, choose Custom/Advanced and decline bundled offers you do not recognize.
If you already installed something suspicious: uninstall it, restart, and scan again.
Treat links and attachments as untrusted by default.
Phishing often impersonates delivery services, banks, and popular brands. If it is unexpected, do not open attachments or log in through the message.
If you entered credentials: change the password immediately and enable 2FA.
Shop safely: research the store, then pay with protection.
Be cautious with brand-new stores, “closing sale” stories, and prices that make no sense. Prefer credit cards or PayPal for dispute options. Avoid wire transfers, gift cards, and crypto payments.
If you already paid: contact your card issuer or PayPal quickly to dispute the transaction.
Crypto rule: never pay a “fee” to withdraw or recover money.
Common patterns include fake profits, then “tax,” “gas,” or “verification” fees. Another is a “recovery agent” who demands upfront crypto.
If you already sent crypto: stop paying, save evidence (wallet addresses, TXIDs, chats), and report the scam to the platform used.
Secure your accounts with unique passwords and 2FA (start with email).
Use a password manager and unique passwords for every account. Enable 2FA using an authenticator app when possible.
If you suspect an account takeover: change passwords, sign out of all devices, and review recent logins and recovery settings.
Back up important files and keep one backup offline.
Backups protect you from ransomware and device failure. Keep at least one backup on an external drive that is not always connected.
If you suspect infection: do not connect backup drives until the system is clean.
If you think you are a victim: stop losses, document evidence, and escalate fast.
Move quickly. Speed matters for disputes, account recovery, and limiting damage.
Stop payments and contact: do not send more money or respond to the scammer.
Call your bank or card issuer: block transactions, replace the card if needed, and start a dispute or chargeback.
Secure your email first: change the email password, enable 2FA, and remove unfamiliar recovery options.
Secure other accounts: change passwords, enable 2FA, and log out of all sessions.
Scan your device: remove suspicious apps or extensions, then run a full malware scan.
Save evidence: screenshots, emails, order pages, tracking pages, wallet addresses, TXIDs, and chat logs.
Report it: to the payment provider, marketplace, social platform, exchange, or wallet service involved.
These rules are intentionally simple. Most online losses happen when decisions are rushed. Slow down, verify independently, and use payment methods and account controls that give you recourse.
Hello! I'm Lapain Epuran, your go-to source for detailed and honest product reviews. From tech gadgets to miracle cures, I provide insights to help you make informed choices. Join me as we discover what's truly worth your time and money.
