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Trojan.Agent userinit.exe infection


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5 replies to this topic

#1 stevemceskimo

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Posted 09 January 2009 - 02:44 AM

I'm working on my father in law's PC which was massively infected with SpywareGuard, Vundo, etc. All were successfully cleaned, and Malwarebytes ran clean for about 4 days. Now when I scan with MWB I see (as shown below in log) infected registry data items, specifically userinit.exe Other tools (superantispyware, etc. scan clean).

FWIW the userinit.exe's in system32 and the dllcache are 109K with a modified date of 12/26 on an XP Pro SP3 machine (I'm thinking this should be closer to 30K).

Any help appreciated!

-stevemc




Malwarebytes' Anti-Malware 1.32
Database version: 1633
Windows 5.1.2600 Service Pack 3

1/9/2009 2:26:26 AM
mbam-log-2009-01-09 (02-26-26).txt

Scan type: Quick Scan
Objects scanned: 65860
Time elapsed: 1 minute(s), 31 second(s)

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

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Agent) -> Data: c:\windows\system32\userinit.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Trojan.Agent) -> Data: system32\userinit.exe -> Quarantined and deleted successfully.

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

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#2 Orange Blossom

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Posted 09 January 2009 - 10:26 AM

As this is a MalwareBytes log, I am shifting this to the Am I Infected forum where you can receive more immediate assistance.

~ OB
Help us help you. If HelpBot replies, you MUST follow step 1 in its reply so we know you need help.

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#3 stevemceskimo

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Posted 09 January 2009 - 12:59 PM

Thanks, so I posted in the wrong place.

stevemc

#4 boopme

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Posted 15 January 2009 - 02:32 PM

Hello if you still need assistance please update and run MBam again like this.

Open MBAM in normal mode and click Update tab, select Check for Updates,when done
click Scanner tab,select FULL scan and scan.
After scan click Remove Selected, Post new scan log and Reboot.


Hello if you still need assistance please update and run MBam again like this.

Open MBAM in normal mode and click Update tab, select Check for Updates,when done
click Scanner tab,select FULL scan and scan.
After scan click Remove Selected, Post new scan log and Reboot.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#5 stevemceskimo

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Posted 15 January 2009 - 11:48 PM

Well, I had to catch a flight back across the country, so I didn't wait for a reply. The results of multiple full scans with MWB were always the same: it would detect the same two files, say they were deleted successfully. The next time I ran a scan they would be back. I could see from browsing a backup of the computer that the userinit.exe post SP3 in 6/08 had been 26K rather than 110K. So I mounted an image backup as a read-only drive, renamed the suspect userinit.exe to userinit.bad and copied over the file from the backup. Running MWB this time resulted in the (bad) file actually being deleted and subsequent scans over 4 days with multiple tools show the machine to be clean.

Thank you, though, for your help. This forum and the website are real godsends, especially appreciated now that we've seen through Castle Cops demise that volunteer resources and good works are NOT unlimited.

stevemc

#6 boopme

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Posted 16 January 2009 - 11:19 PM

Good work and thanks for the info and kind words!!

Now 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.
  • 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.
Vista Users can refer to these links: Create a New Restore Point and Disk Cleanup.
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