BuP1w EXPOSED: .BuP!w3 Files, BuP1wDecryptor@.txt, and a 48-Hour $600k Clock

You open Documents the way you did yesterday. The first photo should still be 1.jpg. The snapshot should still be 2.png. The vacation shot should still be vacation.jpg. The invoice should still be invoice-2026.pdf. Instead every familiar name has a second ending tacked on. 1.jpg is now 1.jpg.BuP!w3. A small text file named BuP1wDecryptor@.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.

Overview

BuP1w ransomware locks the files first. Then it keeps the old name and the old type, and hangs .BuP!w3 on the end. Then it drops BuP1wDecryptor@.txt and talks like a recovery desk. The note is a storefront. It shouts that your files have been encrypted by BuP1w ransomware. It prints a 48-hour clock and a $600,000 Bitcoin ask. It prints a Bitcoin wallet. It tells you to email proof of payment to ransomclub@yahoo.com. It signs the flyer Ran$omClub. It is not a real club. It is a costume on a locker.

If you are staring at a pile of .BuP!w3 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 the sample used for this page, 1.jpg becomes 1.jpg.BuP!w3. 2.png becomes 2.png.BuP!w3. vacation.jpg becomes vacation.jpg.BuP!w3. invoice-2026.pdf becomes invoice-2026.pdf.BuP!w3. taxes.xlsx becomes taxes.xlsx.BuP!w3. family.mp4 becomes family.mp4.BuP!w3. You can still read what the file used to be. You cannot open it. Windows may call the type a BuP!w3 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 BuP1wDecryptor@.txt into the same folders. Decryptor sounds like a tool. The @ looks like a ticket. 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. Oooooooops! Your Files Have Been Encrypted By BuP1w Ransomware. Everything is locked. Your documents, photos, databases – all encrypted. You want them back? Pay us. Then a PAYMENT block: Amount: $600.000 USD in Bitcoin. Bitcoin Address: 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. Time: 48 hours. Then instructions: get Bitcoin, send it to that address, email proof to ransomclub@yahoo.com, wait for a decryption tool. A fifth line says for negotiations you can go to – and we negotiate here. The destination after “go to” is blank. This page will not invent an onion, a Session ID, or a second wallet to fill that gap.

The same flyer warns you not to remove the software, not to call police, not to ask for help, and not to try a third-party tool. It says the price goes to $5.000,000 after 48 hours. It says keys are deleted after 1 week. It says files are gone forever. It promises an unlock tool within 24 hours if you pay, then your files return to normal, then they leave your system. It closes with this is not a game, this is business, we want money, you want your files, simple transaction, tick tock, time is running, signed -Ran$omClub-.

A desktop wallpaper can arrive with the same costume. It tells you the files are encrypted. It tells you to open BuP1wDecryptor@.txt and follow the instructions. It signs the glass Ran$omClub. The wallpaper is a pointer. The note is still the checkout. Photograph the wallpaper from a phone if you can do it without mailing anyone. Then stay with the folder.

That is the whole pitch. A locked folder of .BuP!w3 names. A BuP1wDecryptor@.txt file that talks like a recovery brief. A 48-hour clock. A printed $600,000 Bitcoin ask. A printed wallet, 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. One inbox, ransomclub@yahoo.com. A raise to $5,000,000 after 48 hours. A 1-week key-delete threat. A blank negotiation line. A Ran$omClub signature that is not a real club. Public detections include ESET’s MSIL/Filecoder.Chaos.A. That label is Chaos-adjacent. It is not a reason to treat this locker as one of the listed Chaos.B clones. There is no public free decryptor known for this strain. There is no reason to mail that inbox today because a text file told you to.

The .BuP!w3 name is the first warning

Most lockers pick an extension so you notice the change in seconds. BuP1w uses .BuP!w3. 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.BuP!w3. You can still see 2.png inside 2.png.BuP!w3. 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 .BuP!w3 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.BuP!w3 next to BuP1wDecryptor@.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.

BuP1wDecryptor@.txt is a sales floor, not a help file

The ransom note is a plain text file with a name that sounds like a product. BuP1wDecryptor@.txt wants the first click after the panic. Plenty of real software drops a decryptor 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. BuP1w. Decryptor. An @ that looks like a case mark. A .txt ending Windows already trusts. 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 decryptor” when you write the incident down. Copy BuP1wDecryptor@.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 ransomclub@yahoo.com.

Oooooooops is a shout, not a lab report

The first line of the sample is not a diagnosis. It is a headline. Oooooooops! Your Files Have Been Encrypted By BuP1w Ransomware 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 Oooooooops so they sound close to your folder. Anyone can copy a headline. Copying Your Files Have Been Encrypted By BuP1w Ransomware does not mean they can reverse .BuP!w3. 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 ransomclub@yahoo.com.

$600,000 in 48 hours is a printed clock, not a courtesy

The note prints the ask in a PAYMENT block. Amount: $600.000 USD in Bitcoin. Time: 48 hours. That is $600,000. The printed form uses $600.000. The meaning is the same. It is a ransom. It is not a repair fee. It is not a rush charge from a shop you hired.

Forty-eight hours is not a kindness. It is a fuse drawn on the page so waiting feels like a mistake. You are supposed to convert $600,000 in your head, feel the number, then feel the clock, then mail proof to ransomclub@yahoo.com before the raise hits. That is a sales sequence. It is not a service-level agreement.

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. A text file that starts with Oooooooops is not a vendor. A 48-hour clock printed next to $600,000 is not a checkout you should complete.

Do not convert $600,000 in your head and decide it is “not that much” for a company, or “impossible” so you should negotiate. The note already named the next number. 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.

ransomclub@yahoo.com is checkout, not support

The printed contact is ransomclub@yahoo.com. Copy that string exactly. Do not tidy it. Do not add a space. Do not guess a different spelling. The note prints it as the proof aisle. Email proof to: ransomclub@yahoo.com. Then, it says, they send a decryption tool. That is checkout language. It is not a help desk, not a company, and not a person you can leave a review for.

Do not open a mail draft 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 attach 1.jpg.BuP!w3 “just so they can see.” Those inboxes belong to the people who locked the files, or to whoever is standing in that doorway today. Writing them is the product.

The address is branding, the same way .BuP!w3 is branding. Anyone can stand up a lookalike after a wave of locked folders. Writing the first message does not start a warranty. It starts a conversation you cannot enforce. A later stranger who says they “already mailed ransomclub@yahoo.com” has read the same note you did. That is not a credential.

17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV is a wallet, not a key

The note prints a Bitcoin address: 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. Copy that string exactly if it is on your disk. Do not tidy it. Do not shorten it. Do not invent a second wallet because a later message says this one is “old.” The published flyer printed this one. This page will not add another.

A wallet string is an identifier for a responder. It is not a payment instruction you should carry out. It is not a password you redeem by mailing ransomclub@yahoo.com. Do not type it into an exchange “just to see the fee.” Do not paste it into a “wallet checker” a stranger sends. An exchange window is not Photos opening vacation.jpg again.

If a later screenshot shows a different address, treat that extra string as a rewrite or as a second shop. The sample used for this page prints 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. Do not complete a checkout a copycat swapped in.

$5,000,000 after 48 hours and keys deleted after 1 week are the raise

The note does not stop at $600,000. WHAT HAPPENS IF YOU DON’T PAY: Price goes to $5.000,000 after 48 hours. Keys deleted after 1 week. Files gone forever. That is $5,000,000. The printed form uses $5.000,000. The meaning is the same. It is a second sticker glued on so the first one feels like a bargain.

Do not start a personal countdown because a flyer printed 48 hours. Do not stay up all night so you “still have time.” Do not mail ransomclub@yahoo.com at hour 47 to “hold the original $600,000.” The raise is theater. Whether they can actually delete keys on day 7 is not a puzzle you solve at the kitchen table. The files are already locked. Feeding the inbox a clock will not unlock 1.jpg.BuP!w3.

There is no extra victim $ printed beyond those two figures. This page will not invent a third price, a “family discount,” or a per-file rate. If a later message quotes $600,000 and then adds a new number, that new number is not in the original flyer. Leave it uninvented.

Ran$omClub is a costume, not a real club

Ran$omClub is two ordinary words with a dollar sign jammed in. Clubs, forums, podcasts, and shops use ransom club language all the time. This page is not a smear of any of them. If a forum, a Discord, a meetup, or a brand you actually know happens to share those words, that does not make it this locker. This locker is the one that appends .BuP!w3, drops BuP1wDecryptor@.txt, prints ransomclub@yahoo.com, and signs the flyer -Ran$omClub-.

Do not hunt a club folder because the note used those words. Do not mail a real organization as if they ran the lock. Do not review-bomb a harmless community because a ransomware flyer stole the English. The brand on the page is costume. The evidence is the extra ending on 1.jpg.BuP!w3, plus the note that names $600,000, 48 hours, and that Yahoo inbox.

A later helper will blur that line on purpose. They will say “Ransom Club files” as if they were talking about a product you joined. They will ask you to install a “club repair” that is just more malware. Stay with the extension. Stay with the note filename. Stay with ransomclub@yahoo.com. Those are the strain marks. A shared English phrase is not.

Chaos-adjacent is a label, not a free key

Public detections include ESET’s MSIL/Filecoder.Chaos.A. Microsoft has used Ransom:MSIL/FileCoder.AD!MTB. Kaspersky has used HEUR:Trojan-Ransom.MSIL.Agent.gen. Those strings are labels on a sample. They are not a decryptor sitting in your Downloads folder.

Chaos.A puts this locker next to Chaos-family filecoders. That is adjacency, not a clone list. This page will not treat BuP1w as one of the listed Chaos.B clones. It will not borrow another family’s onion, Session ID, or extra wallet and paste them here. The folder marks still matter more than the family name: .BuP!w3, BuP1wDecryptor@.txt, ransomclub@yahoo.com, 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV, and the $600,000 / 48-hour clock.

A later stranger will quote Chaos so they sound close to a lab. Reciting MSIL/Filecoder.Chaos.A does not mean they can reverse vacation.jpg.BuP!w3. It means they can read a detection line. Stay with the files on disk. Stay with the note on disk. Do not mail the inbox because a family name made the case feel “known.”

How The Attack Works

The shop is simple once you stop reading it as a rescue. Lock the files. Brand the names with .BuP!w3. Drop BuP1wDecryptor@.txt. Point the wallpaper at that file. Shout Oooooooops. Print $600,000 in Bitcoin and a 48-hour clock. Print 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. Point proof at ransomclub@yahoo.com. Leave the negotiation door blank. Forbid police and third-party tools. Raise the sticker to $5,000,000 after 48 hours. Threaten key deletion after 1 week. Sign it Ran$omClub. Then wait for someone else to sell the missing key.

1. The lock keeps the old name so you recognize the loss

BuP1w encrypts the files it wants as leverage, then appends .BuP!w3. That is why 1.jpg is still readable as 1.jpg.BuP!w3, and why 2.png is still readable as 2.png.BuP!w3. 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. Do not plug in a copy “just to check.” Checking is how the extra copy gets the same .BuP!w3 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 ransomclub@yahoo.com to confirm what you are looking at.

2. BuP1wDecryptor@.txt turns a break-in into a ticket

Once the names are branded, the malware needs a voice. It drops BuP1wDecryptor@.txt in the same folders. A how-to in the listing feels like the machine is still trying to help. It feels like a recovery brief you should finish before you do anything else. That is how a locked photo folder starts to feel like a checkout.

The note is also a hiding trick. While you are reading Oooooooops, you stop calmly sorting 1.jpg.BuP!w3 next to 2.png.BuP!w3. You stop looking at what still opens. You start looking at a clock. The demand is in your face. The evidence is underneath. Keep the note. The files next to it still matter more than the shout.

Notice what the note does give you, and what it does not. It gives you a $600,000 Bitcoin ask. It gives you a 48-hour clock. It gives you a wallet. It gives you one inbox. 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 filled negotiation door. 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.

3. The wallpaper points you back at the same flyer

The costume can also take the desktop. The wallpaper used with this locker says the files are encrypted. It tells you to open BuP1wDecryptor@.txt and follow the instructions. It signs the glass Ran$omClub. That is a pointer, not a second shop. The wallpaper wants the first click after you sit down. The note still holds the $600,000, the wallet, and ransomclub@yahoo.com.

Do not treat a changed desktop as a separate incident. Do not hunt a second inbox because the wallpaper used a friendlier voice than the text file. Do not “follow the instructions” because the glass used a smiley. A smiley on a ransom wallpaper is still a ransom wallpaper. Photograph it from a phone if you can. Then leave the wallpaper alone.

If the wallpaper comes back after you change it, that is the point. A locker wants the flyer in your face. Finding it on the glass again is not a second case. It is one incident with a loud pointer that refuses to get out of the way. You do not need to argue with it. You do not need to open the note again to prove you are a real victim.

4. $600,000 and 48 hours light the clock

After the shout, the note lights a fuse. Amount: $600.000 USD in Bitcoin. Time: 48 hours. Other families skip the number and force a chat. This one prints both the sticker and the timer so you can pay without thinking. $600,000 in 48 hours is meant to feel like the only adult math left in the room.

Do not add a smaller clock the flyer never printed. Do not start a personal countdown because a forum post said “they only wait two days.” The published flyer already printed 48 hours. It already printed the raise. Leave a third fuse uninvented.

Silence is not rude here. Silence is how you stay out of their queue. A relative, an insurer, or an incident lead can still talk on a phone. The people who locked the files do not get a seat in that call.

5. Email proof to ransomclub@yahoo.com is the door they want

The recovery steps on the note are a shopping list. 1. Get Bitcoin. 2. Send to our address. 3. Email proof to: ransomclub@yahoo.com. 4. We send decryption tool. That is the whole door. It looks like support because support uses mail. Criminal shops use mail too, because a thread is where a printed $600,000 becomes a negotiation and a locked photo becomes a sample they asked you to attach.

Do not write that inbox. 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 filename. A photo of 1.jpg.BuP!w3 sitting next to BuP1wDecryptor@.txt does not make you a verified customer. It makes you a person still following the flyer.

If someone later says they will “talk to Ran$omClub for you” through that same inbox, 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 Notepad at midnight.

6. The blank negotiation line is not an onion

Instruction 5 says for negotiations you can go to – and we negotiate here. The place after “go to” is empty. That blank is not a puzzle. This page will not invent an .onion link to finish their sentence. It will not invent a Session ID. It will not invent a second inbox. It will not invent a Telegram handle. If a later screenshot shows extra lines, treat those extras as a different flyer or as a rewrite. The note used for this page names ransomclub@yahoo.com, 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV, $600,000, and 48 hours. Do not complete a checkout they left off the page.

A missing door also gives copycats a job. They will sell the missing string. They will say they have the operator’s real onion. They will ask you to mail ransomclub@yahoo.com first, then paste what they send. That is still the same shop, or a second shop standing in the same doorway. The public flyer left the field empty. Do not finish it for them.

If your own copy of BuP1wDecryptor@.txt is still blank on that line, it is blank. Do not tidy it. Do not fill a public screenshot so it looks more complete. The gap is evidence. It is not a coupon.

7. Don’t call police is how they keep you in the shop

The note has a DON’T EVEN TRY list. Removing this software. Calling police. Asking for help. Trying to decrypt yourself. And never use a third party tool to decrypt this. If you use a third party tool, we will not hesitate to destroy your device. That is not a support policy. That is how a locker keeps you in the chair with the inbox still open.

Do not treat that list as a technician. Criminal shops love “do not call police” warnings because a report is how a lot of people get out of the funnel. The warning also makes the flyer feel official, like a legal notice you must not interrupt. It is still a flyer. It is still sitting next to files that already end in .BuP!w3.

This page will not walk you through bargaining with that list. It will tell you the list is not in charge of the incident. The people whose files lived on the machine still need a real plan. The note does not get a vote. Official desks still exist. The flyer does not get to forbid them.

8. $5,000,000 after 48 hours and keys deleted after 1 week are the second squeeze

After the shopping list, the note lights a second fuse. Price goes to $5.000,000 after 48 hours. Keys deleted after 1 week. Files gone forever. Other families use a password retry counter. This one uses money and a calendar. The feeling is the same. Wait, and something worse happens. Pay $600,000 now, and maybe the worse thing stays off.

Do not send a small file because a later message offered a test decrypt the original note never printed. The published flyer did not print a demo. It printed a 24-hour unlock promise after payment: we send unlock tool within 24 hours, your files return to normal, we leave your system. That promise is still attacker copy. A 24-hour delivery claim is not a tracking number.

There is no leak line in this costume. The note does not say they already copied mail, payroll, or photos. It does not name a leak site. Do not invent that threat because other families use it. The published flyer talks about encryption, $600,000, 48 hours, $5,000,000, a 1-week key delete, and ransomclub@yahoo.com. That is enough theater. Leave the rest uninvented.

9. Third parties will sell a BuP1w conversation

After a ransomware incident, search results fill up with companies that say they can decrypt BuP1w or “all .BuP!w3 files.” Some of those shops are ordinary overpriced consultants. Plenty are a second scam. They will quote Oooooooops so they sound close to the case. They will mention $600,000. They will mention 48 hours. They will mention ransomclub@yahoo.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 wallet string that makes an exchange window appear. An exchange window is not Photos opening vacation.jpg again. If a later message skips the original inbox and asks for coin over ordinary chat, that is still the same market, or a copycat standing in the same doorway. Do not answer. Do not help them fill the blank negotiation line the note left empty.

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 $600,000 send. It does not need ransomclub@yahoo.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 BuP1w key” as a second sales pitch.

10. Payment and mailing that inbox close nothing

Paying a stranger for a private key is not a guarantee. The people who send the note can take the $600,000 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. A mail thread makes that outcome easier, not harder. You cannot leave a review on ransomclub@yahoo.com.

Mailing that inbox 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.

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 BuP1wDecryptor@.txt again is not useful work. It is the checkout, even when the flyer already printed the wallet and the $600,000.

What To Do If Your Files End in .BuP!w3

Do not pay $600,000. Do not pay $5,000,000. Do not mail ransomclub@yahoo.com. Do not type 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV into an exchange, a “wallet checker,” or a form a stranger sends back. Do not invent an onion, a Session ID, or a second wallet to finish the blank negotiation line. 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 $600,000” for anyone who quotes the note.

• STEP 1: Use Rkill to terminate suspicious programs.
• STEP 2: Use Malwarebytes to remove for Ransomware and Unwanted Programs
• STEP 3: Use HitmanPro to remove Trojans and other Malware
• STEP 4: Use AdwCleaner to remove Malicious Browser Extensions and Adware
• STEP 5: Perform a final check with ESET Online Scanner
• STEP 6: Restore the files encrypted by ransomware

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.

1. 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)

2. 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.

1. 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.

   

   DOWNLOAD MALWAREBYTES FOR WINDOWS (FREE)
   
   (The link opens in a new page where your download will start)

2. 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.

   

3. 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.

     

4. 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.

5. Start the Scan

   Click the blue Scan button. Malwarebytes will automatically update its virus database and start checking your computer for malware.

   

6. 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.

   

7. 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.

   

8. 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.)

1. Download HitmanPro

   Click the button below to download HitmanPro. Remember — the scan is free, so you have nothing to lose by checking your PC.

   DOWNLOAD HITMANPRO (FREE SCAN)
   (The link opens in a new page where your download will start)

2. Install HitmanPro

   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.

   

3. 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.

   

   

4. 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.
   

5. 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.

   

6. 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.

1. Download AdwCleaner

   Click the button below to download AdwCleaner — it’s free, portable, and requires no installation.

   

   DOWNLOAD ADWCLEANER (FREE)
   (The link opens in a new page where your download will start)

2. Run AdwCleaner

   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.

   

3. 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“.

   

4. Start the Scan

   Click “Dashboard” on the left side of the window, then click the “Scan” button.

   

5. 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.

   

6. 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.

   

7. 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.

1. Download ESET Online Scanner

   Click the button below to download ESET Online Scanner.

   

   DOWNLOAD ESET ONLINE SCANNER (FREE)
   (The link opens in a new page where your download will start)

2. Run the Installer

   When the download finishes, open your Downloads folder and double-click “esetonlinescanner.exe“.
   

3. 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.
   

4. 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.

   

5. 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.

   

6. 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.

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:

• https://id-ransomware.malwarehunterteam.com/
• https://decrypter.emsisoft.com/
• https://noransom.kaspersky.com/
• https://www.avast.com/ransomware-decryption-tools

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.

1. Download EaseUS Data Recovery Wizard Free.

   You can download EaseUS Data Recovery Wizard Free by clicking the link below.

   

   EASEUS DATA RECOVERY WIZARD FREE DOWNLOAD LINK
   (The above link will open a new page from where you can download EaseUS Data Recovery Wizard)

2. 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.

3. 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.
   

4. 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“.
   

5. 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.
   

6. 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.
   

7. 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.

1. Download ShadowExplorer.

   You can download ShadowExplorer from the below link.

   SHADOW EXPLORER DOWNLOAD LINK
   (This link will open a new web page from where you can download “ShadowExplorer”)

2. Install ShadowExplorer.

   Double-click on the ShadowExplorer-x.x-setup file to start the installation process, then follow the on-screen promts to install this program.
   

3. 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.

   

4. 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 .BuP!w3 name exactly as it is. Keep at least one locked sample. Do not bulk-rename 1.jpg.BuP!w3 back to 1.jpg, or 2.png.BuP!w3 back to 2.png, or vacation.jpg.BuP!w3 back to a normal JPEG, or invoice-2026.pdf.BuP!w3 back to a normal PDF, or taxes.xlsx.BuP!w3 back to a spreadsheet, or family.mp4.BuP!w3 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 .BuP!w3. You do not need to edit it to know what you lost.

Keep BuP1wDecryptor@.txt with the locked files. Do not “clean up” every copy of the note. Do not fill the blank negotiation line so the flyer looks complete. The $600.000 line, the $5.000,000 raise, the 48-hour clock, the 1-week key-delete line, 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV, and ransomclub@yahoo.com are how you prove this was this strain and not a different locker that only sounds similar. Those artifacts are evidence. They are not instructions you should carry out.

Do not pay $600,000. Do not mail that inbox. Do not ask a friend to write them “just to see.” A printed $600,000 is still a ransom. A calm Yahoo address is still the people who locked the files. If a later message quotes BuP1wDecryptor@.txt and offers “the real wallet,” that is still the same shop. If a later message skips the original inbox and asks for coin over a different address, that is still the same shop, or a copycat standing in the same doorway.

This is not a real Ransom Club. Ran$omClub is a signature on a locker. It is not a membership. It is not a forum you joined. It is not a reason to blame a real club, a real Discord, or a real brand that happens to share ordinary English. Stay with .BuP!w3. Stay with BuP1wDecryptor@.txt. Stay with ransomclub@yahoo.com.

If someone claims they can already decrypt BuP1w files for a fee because they can recite $600,000, 48 hours, and Chaos.A, they are selling a report, not a key. If they mention ransomclub@yahoo.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 .BuP!w3 type, decline it. There is no player for that ending.

The Bottom Line

BuP1w ransomware is a locker with a readable filename, a decryptor-shaped note, and a 48-hour $600,000 clock. It keeps the old name and appends .BuP!w3. 1.jpg becomes 1.jpg.BuP!w3. The note is BuP1wDecryptor@.txt. It shouts Oooooooops! Your Files Have Been Encrypted By BuP1w Ransomware. It prints Amount: $600.000 USD in Bitcoin, Time: 48 hours, and Bitcoin Address: 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV. It tells you to email proof to ransomclub@yahoo.com. It leaves the negotiation door blank. It says the price goes to $5.000,000 after 48 hours and that keys are deleted after 1 week. It signs the flyer -Ran$omClub-. That is a costume, not a real club. Public detections include ESET’s MSIL/Filecoder.Chaos.A, which is Chaos-adjacent, not a listed Chaos.B clone. There is no public free decryptor known for this strain.

Do not pay $600,000. Do not mail that inbox. Do not invent an onion. Do not rename the pile in bulk. Keep BuP1wDecryptor@.txt and a .BuP!w3 sample. If you take one sentence with you, take this. A folder of names ending in .BuP!w3, plus BuP1wDecryptor@.txt with a $600,000 / 48-hour ask, 17CqMQFeuB3NTzJ2X28tfRmWaPyPQgvoHV, and ransomclub@yahoo.com, is ransomware on the first sighting. Treat it that way before anyone offers to fill the blank line the note left empty.