Solved Chrome default search engine changed to "yamdex.net" (malware)

GeorgeA

New Member
Thread author
Aug 7, 2015
4
I've just installed AdwCleaner, FRST and aswMBR. I'm attaching the scan logs. AdwCleaner and aswMBR scans have revealed an inffected file: C:\Windows\system32\drivers\netfilter2.sys (Win32:Malware-gen). I didn't fix the problem since I'd better do so under qualified help. I'm also attaching Trojan Remover log of 3 August 2015. I'm also attaching a screenshot from Chrome. My system langauge is Russian but I've provided the translation.
Thank you in advance to anyone investing time in this for fixing the problem. I'll be grateful for you assitance!
 

Attachments

  • FRST.txt
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  • Addition.txt
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  • FRST.txt
    65.3 KB · Views: 1
  • aswMBR.txt
    1.7 KB · Views: 0
  • TRLOG.txt
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  • scrnsht.jpg
    scrnsht.jpg
    125.6 KB · Views: 2

TwinHeadedEagle

Level 41
Verified
Mar 8, 2013
22,627
Hello,



They call me TwinHeadedEagle around here, and I'll be working with you.



Before we start please read and note the following:
  • At the top of your post, please click on the "Watch thread" button and make sure to check Watch this thread...and receive email notifications. This will send an email to you as soon as I reply to your topic, allowing me to solve your problem faster.
  • Please do not install any new software during the cleaning process other than the tools I provide for you. This can hinder the cleaning process. Please do not perform System Restore or any other restore.
  • Instructions I give to you are very simple and made for complete beginner to follow. That's why you need to read through my instructions carefully and completely before executing them.
  • Please do not run any tools other than the ones I ask you to, when I ask you to. Some of these tools can be very dangerous if used improperly. Also, if you use a tool that I have not requested you use, it can cause false positives, thereby delaying the complete cleaning of your machine.
  • All tools we use here are completely clean and do not contain any malware. If your antivirus detects them as malicious, please disable your antivirus and then continue.
  • If during the process you run across anything that is not in my instructions, please stop and ask. If any tool is running too much time (few hours), please stop and inform me.
  • I visit forum several times at day, making sure to respond to everyone's topic as fast as possible. But bear in mind that I have private life like everyone and I cannot be here 24/7. So please be patient with me. Also, some infections require less, and some more time to be removed completely, so bear this in mind and be patient.
  • Please stay with me until the end of all steps and procedures and I declare your system clean. Just because there is a lack of symptoms does not indicate a clean machine. If you solved your problem yourself, set aside two minutes to let me know.
  • Please attach all report using
    fjqb1h.png
    button below. Doing this, you make it easier for me to analyze and fix your problem.

  • Do not ask for help for your business PC. Companies are making revenue via computers, so it is good thing to pay for the repair.
  • If I don't hear from you within 3 days from this initial or any subsequent post, then this thread will be closed.




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Rules and policies

We won't support any piracy.
That being told, if any evidence of illegal OS, software, cracks/keygens or any other will be revealed, any further assistance will be suspended. If you are aware that there is this kind of stuff on your machine, remove it before proceeding!
The same applies to any use of P2P software: uTorrent, BitTorrent, Vuze, Kazaa, Ares... We don't provide any help for P2P, except for their removal. All P2P software has to be uninstalled or at least fully disabled before proceeding!

Failure to follow these guidelines will result with closing your topic and withdrawning any assistance.



51a46ae42d560-malwarebytes_anti_malware.png
Scan with Malwarebytes' Anti-Malware

Please download Malwarebytes Anti-Malware and save it to your desktop.
  • Install the progam and select update.
  • Once updated, click the Settings tab, in the left panel choose Detection & Protection and tick Scan for rootkits.
  • In the same tab, under PUP and PUM detections make sure it is set to Treat detections as malware.
  • Click the Scan tab, choose Threat Scan is checked and click Scan Now.
  • If threats are detected, click the Apply Actions button. You will now be prompted to reboot. Click Yes.
  • Upon completion of the scan (or after the reboot), click the History tab.
  • Click Application Logs and double-click the Scan Log.
  • At the bottom click Export and choose Text file.
Save the file to your desktop and include its content in your next reply.



51a612a8b27e2-Zoek.png
Scan with ZOEK

Please download ZOEK by Smeenk and save it to your desktop (preferred version is the *.exe one)
Temporary disable your AntiVirus and AntiSpyware protection - instructions here.

  • Right-click on
    51a612a8b27e2-Zoek.png
    icon and select
    RunAsAdmin.jpg
    Run as Administrator to start the tool.
  • Wait patiently until the main console will appear, it may take a minute or two.
  • In the main box please paste in the following script:
    Code:
    createsrpoint;
    autoclean;
    emptyalltemp;
    ipconfig /flushdns >>"%temp%\log.txt";b
  • Make sure that Scan All Users option is checked.
  • Push Run Script and wait patiently. The scan may take a couple of minutes.
  • When the scan completes, a zoek-results logfile should open in notepad.
  • If a reboot is needed, it will be opened after it. You may also find it at your main drive (usually C:\ drive)

Post its content into your next reply.
 

GeorgeA

New Member
Thread author
Aug 7, 2015
4
TwinHeadedEagle, it's nice to meet you! I've done as you said. Good news: my default search engine is now Google! That's awesome. Do you reckon there's something else to be done? Also, could you please advise on what software should I use to avoid getting infected in future? I'm currently not using any anti-virus or any other protection program.
I'm attaching the logs as requested.
 

Attachments

  • mamh scan log 07-08-15.txt
    54.9 KB · Views: 3
  • zoek-results.txt
    22.2 KB · Views: 4

TwinHeadedEagle

Level 41
Verified
Mar 8, 2013
22,627
Glad to hear it. Can you run one more MalwareBytes scan?

adwcleaner_new.png
Fix with AdwCleaner

Please download AdwCleaner by Xplode and save the file to your Desktop.
  • Right-click on
    adwcleaner_new.png
    icon and select
    RunAsAdmin.jpg
    Run as Administrator to start the tool.
  • Wait until the database is updated.
  • Accept the Terms of use and click Scan.
  • When finished, please click Clean.
  • Upon completion, click Report. A log (AdwCleaner[S*].txt) will open.

Please include the contents of that file in your reply.

Note: Reports will be saved in your system partition, usually at C:\Adwcleaner
 

GeorgeA

New Member
Thread author
Aug 7, 2015
4
Thanks, TwinHeadEagle. I'm attaching the scan logs now. Unfortunately, the language of the AdwCleaner log is Russian though I suppose I could change the language for later scans if needed.
 

Attachments

  • mamh scan log 09-08-15.txt
    1.2 KB · Views: 2
  • AdwCleaner[S0].txt
    7.9 KB · Views: 2

GeorgeA

New Member
Thread author
Aug 7, 2015
4
The PC behaves very well. I can't notice any fault. The Chrome engine works just fine and there are no startup error windows that pop up.
Looking at the Task Manager the only process I'm unsure of is cohc.exe but that's probably something related to the system. So I guess that's fine.
I'm considering installing Eset NOD32 now since my relatives bought a version for 3 PCs and would like to share.
 

TwinHeadedEagle

Level 41
Verified
Mar 8, 2013
22,627
Glad I could help. We will delete all used tools and I'll give you some tips to harden your security and learn how to protect yourself :)


Recommended reading:
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MUST READ - security tips:

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MUST READ - general maintenance:


The Importance of Software Updating:

In order to stay protected it is
very important that you regularly update all of your software. Cybercriminals depend on the apathy of users around software updates to keep their malicious endeavor running.

Operating systems, such as Windows, and applications, such as Adobe Reader or JAVA, are used by tens of millions of computers and devices around the world, making them a huge target for cybercriminals. Downloading updates and installing them can sometimes be tedious, but the advantages you get from the updates are certainly worth it.




Recommended additional software:
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CCleaner - to clean unneeded temporary files.
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Malwarebytes' Anti-Malware - to scan your system from time to time in search for malware.
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Malwarebytes' Anti-Exploit - to prevent plenty of mostly exploited vulnerabilities.
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McShield - to prevent infections spread by removable media.
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Unchecky - to prevent from installing additional foistware, implemented in legitimate installations.
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Adblock - to surf the web without annoying ads!



Post-cleanup procedures:


Download DelFix by Xplode and save it to your desktop.
  • Run the tool by right click on the
    51a5ce45263de-delfix.png
    icon and Run as administrator option.
  • Make sure that these ones are checked:
    • Remove disinfection tools
    • Purge system restore
    • Reset system settings
  • Push Run and wait until the tool completes his work.
  • All tools we used should be gone. Tool will create an report for you (C:\DelFix.txt)
The tool will also record healthy state of registry and make a backup using ERUNT program in %windir%\ERUNT\DelFix
Tool deletes old system restore points and create a fresh system restore point after cleaning.



My help is free for everybody.
If you're happy with the help provided and/or wish to buy me a beer for the assistance you received, then you can consider a donation:
Thank you!​




Stay safe,
TwinHeadedEagle :)
 

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