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Vundo trojan and pop-ups


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#1 Dirty_Diana

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Posted 07 December 2008 - 10:10 PM

Hey garmanma, you and malwarebytes anti-malware rock!!
I normally wouldn't bother signing up on forums, but I felt I just had to say a big thank-you.
I was having this exact problem. Initially I didn't know it was the VUNDO trojan. I was getting all these @$#!! popup ads opening up out of the blue, and spent hours over the weekend scanning with macafee, lavasoft ad-aware, trendmicro, all to no avail. Ad-aware found infected registry entries containing "6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C" and it supposedly removed them, but then they simply came back. I searched the registry and tried manually deleting them, but they always re-spawned, and the popups didn't stop.
I tried a system restore in XP but my computer didn't have a restore point going back far enough in time to before I got the problem. I was almost resigned to having to do a full system recovery and losing everything when I found this thread.
So I said what the heck I would try this one last thing. I downloaded and ran the malwarebytes anti-malware. Did the quick scan as per your post. It ran for around 11 minutes and found 40+ infected items!! All the other software I tried ran for hours and didn't resolve the issue or find as many infected items.
Part of the log is shown below:
Malwarebytes' Anti-Malware 1.31
Database version: 1472
Windows 5.1.2600 Service Pack 3

12/7/2008 6:09:37 PM
mbam-log-2008-12-07 (18-09-37).txt

Scan type: Quick Scan
Objects scanned: 60391
Time elapsed: 11 minute(s), 53 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 4
Registry Keys Infected: 20
Registry Values Infected: 4
Registry Data Items Infected: 2
Folders Infected: 2
Files Infected: 21

After it did the removal of infected items, there was a message that 4 items containing the "6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C" couldn't be removed. But then I rebooted, and rescanned and it came up clean. I searched the registry again. Found one entry containing "6D794CB4-C7CD-4c6f-BFDC-9B77AFBDC02C" in the cached section and I deleted that manually. Searched the registry again, and it didn't appear to respawn.
The popups have stopped, and I'm super-happy :flowers: :thumbsup: !!
I'm going to do a FULL scan just to make absolutely sure, but it is looking good.

Many thanks again!!!

Edited by Dirty_Diana, 07 December 2008 - 10:12 PM.


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#2 Dirty_Diana

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Posted 14 December 2008 - 04:10 AM

One other thing I want to mention...
The VUNDO trojan also disabled my Windows Update. So if you find that you cannot start up the Windows Auto Update service, or the microsoft update website tells you that it cannot process updates for you because the service hasn't been started, those are further indications that you could have the VUNDO trojan.

#3 quietman7

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Posted 14 December 2008 - 03:03 PM

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Start > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Start > Run and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Tips to protect yourself against malware and reduce the potential for re-infection:
• "Simple and easy ways to keep your computer safe".
• "How did I get infected?, With steps so it does not happen again!".
• "Hardening Windows Security - Part 1 & Part 2".
• "IE Recommended Minimal Security Settings" - "How to Secure Your Web Browser".

• Avoid gaming sites, underground web pages, pirated software, crack sites, and peer-to-peer (P2P) file sharing programs. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. Many malicious worms and Trojans spread across P2P file sharing networks, gaming and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and Flash ads that install viruses, Trojans and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications. Read P2P Software User Advisories and Risks of File-Sharing Technology.
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