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Userinit.exe infected by Trojan horse Sheur2.AJJE


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#1 jdhgoodgrief

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Posted 12 June 2009 - 04:46 PM

After managing to solve some fairly serious computer problems myself, I'm left with this very recently recurrnt problem: AVG and Malwarebytes keep spotting this Trojan in the userinit.exe file in the System32 folder. This file is 'white-listed' so I can't remove it, and Google searches (which brought me here) reveal that deleting it would be a bad idea.

This is my just completed Malwarebytes log. I'm not sure what other logs you would like me to post, or where to find them. Many apologies if I have failed to provide important information.

I am using Windows XP Service Pack 3.

Sincere thanks in advance to anybody who helps.

Malwarebytes' Anti-Malware 1.37
Database version: 2263
Windows 5.1.2600 Service Pack 3

12/06/2009 22:40:10
mbam-log-2009-06-12 (22-40-10).txt

Scan type: Quick Scan
Objects scanned: 111985
Time elapsed: 16 minute(s), 34 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 2
Registry Data Items Infected: 1
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:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\id (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\host (Malware.Trace) -> Quarantined and deleted successfully.

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

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

Edit: Moved topic from XP to the more appropriate forum. ~ Animal

Thanks Animal, sorry for the misplaced post!

Edited by jdhgoodgrief, 12 June 2009 - 04:56 PM.


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#2 boopme

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Posted 12 June 2009 - 09:07 PM

Hello and welcome..

Rerun MBAM like this:

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


Next run ATF and SAS:
Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

From your regular user account..
Download Attribune's ATF Cleaner and then SUPERAntiSpyware , Free Home Version. Save both to desktop ..
DO NOT run yet.
Open SUPER from icon and install and Update it
Under Scanner Options make sure the following are checked (leave all others unchecked):
Close browsers before scanning.
Scan for tracking cookies.
Terminate memory threats before quarantining
.
Click the "Close" button to leave the control center screen and exit the program. DO NOT run yet.

Now reboot into Safe Mode: How to enter safe mode(XP)
Using the F8 Method
Restart your computer.
When the machine first starts again it will generally list some equipment that is installed in your machine, amount of memory, hard drives installed etc. At this point you should gently tap the F8 key repeatedly until you are presented with a Windows XP Advanced Options menu.
Select the option for Safe Mode using the arrow keys.
Then press enter on your keyboard to boot into Safe Mode
.

Double-click ATF-Cleaner.exe to run the program.
Under Main "Select Files to Delete" choose: Select All.
Click the Empty Selected button.

If you use Firefox or Opera browser click that browser at the top and choose: Select All
Click the Empty Selected button.
If you would like to keep your saved passwords, please click No at the prompt.
Click Exit on the Main menu to close the program
.

NOW Scan with SUPER
Open from the desktop icon or the program Files list
On the left, make sure you check C:\Fixed Drive.
Perform a Complete scan. After scan,Verify they are all checked.
Click OK on the summary screen to quarantine all found items.
If asked if you want to reboot, click "Yes" and reboot normally.

To retrieve the removal information after reboot, launch SUPERAntispyware again.
Click Preferences, then click the Statistics/Logs tab.
Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
If there are several logs, click the current dated log and press View log.
A text file will open in your default text editor.
Please copy and paste the Scan Log results in your next reply.
Click Close to exit the program.


Please ask any needed questions,post logs and Let us know how the PC is running now.
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

#3 jdhgoodgrief

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Posted 13 June 2009 - 04:39 AM

Thanks! Here's the log from MBAM:

Malwarebytes' Anti-Malware 1.37
Database version: 2271
Windows 5.1.2600 Service Pack 3

13/06/2009 10:39:04
mbam-log-2009-06-13 (10-39-04).txt

Scan type: Quick Scan
Objects scanned: 112519
Time elapsed: 16 minute(s), 9 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 2
Registry Data Items Infected: 1
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:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\id (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\host (Malware.Trace) -> Quarantined and deleted successfully.

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

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

#4 jdhgoodgrief

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Posted 13 June 2009 - 04:58 AM

Major problem though: ATF-Cleaner.exe does not show up on the desktop while in Safe Mode...

#5 boopme

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Posted 13 June 2009 - 09:27 AM

It may be just off screen. Move the icon to the top left while in normal mode. then try again.. Post the SAS log also please.

Then
Rerun MBAM like this:

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

#6 jdhgoodgrief

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Posted 13 June 2009 - 12:56 PM

Nope, ATF Cleaner does not show up at all on Safe Mode desktop. I copied the file into My Documents in the hope of copying it back in safe mode, but it does not show up there either.

Running SAS in safe mode right now.

#7 jdhgoodgrief

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Posted 13 June 2009 - 04:25 PM

Second problem. I ran SAS in Safe Mode, it removed 300-odd problems, including the Userinit trojan. But following a reboot into normal mode, there is no record of the three-hour scan in the Preferences Logs section.

Sorry to be a pain!

#8 boopme

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Posted 13 June 2009 - 04:33 PM

Hello, sometimes this happens and it comes back after a shut down and reboot. Also it sometimes shows up in the Admin or other user account.

I am still trying to find why ATF will not work.. This is new to me.. For the sake of trying. Reinstall ATF
Before saving ATF please rename it to zztoy.exe....now save it to your desktop and try again.

Also run MBam once more and see if it comes back clear.
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

#9 jdhgoodgrief

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Posted 13 June 2009 - 04:46 PM

OK, I will do that tomorrow. Some good news though: after running SAS in safe mode, and rebooting, I ran MBAM - and no sign of Userinit! I haven't had AVG pop up warning me about it either, which it has been doing regularly.

I'm running Windows Firewall and Zone Alarm, any more tips on how to avoid a recurrence of this type of attack?

Here's my latest MBAM log:

Malwarebytes' Anti-Malware 1.37
Database version: 2273
Windows 5.1.2600 Service Pack 3

13/06/2009 22:43:51
mbam-log-2009-06-13 (22-43-51).txt

Scan type: Quick Scan
Objects scanned: 112991
Time elapsed: 17 minute(s), 45 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 2
Registry Data Items Infected: 0
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:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\id (Malware.Trace) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\Desktop\host (Malware.Trace) -> Quarantined and deleted successfully.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

#10 boopme

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Posted 13 June 2009 - 05:03 PM

I would alos like to run one more tool please.

Before we start fixing anything you should print out these instructions or copy them to a NotePad file so they will be accessible. Some steps will require you to disconnect from the Internet or use Safe Mode and you will not have access to this page.

Please download Dr.Web CureIt and save it to your desktop. DO NOT perform a scan yet.
alternate download link
Note: The file will be randomly named (i.e. 5mkuvc4z.exe).

Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Scan with Dr.Web CureIt as follows:
  • Double-click on the randomly named file to open the program and click Start. (There is no need to update if you just downloaded the most current version
  • Read the Virus check by DrWeb scanner prompt and click Ok where asked to Start scan now? Allow the setup.exe to load if asked by any of your security programs.
  • The Express scan will automatically begin.
    (This is a short scan of files currently running in memory, boot sectors, and targeted folders).
  • If prompted to dowload the Full version Free Trial, ignore and click the X to close the window.
  • If an infected object is found, you will be prompted to move anything that cannot be cured. Click Yes to All. (This will move any detected files to the C:\Documents and Settings\userprofile\DoctorWeb\Quarantine folder if they can't be cured)
  • After the Express Scan is finished, put a check next to Complete scan to scan all local disks and removable media.
  • In the top menu, click Settings > Change settings, and uncheck "Heuristic analysis" under the "Scanning" tab, then click Apply, Ok.
  • Back at the main window, click the green arrow "Start Scanning" button on the right under the Dr.Web logo.
  • Please be patient as this scan could take a long time to complete.
  • When the scan has finished, a message will be displayed at the bottom indicating if any viruses were found.
  • Click Select All, then choose Cure > Move incurable.
  • In the top menu, click file and choose save report list.
  • Save the DrWeb.csv report to your desktop.
  • Exit Dr.Web Cureit when done.
  • Important! Reboot your computer because it could be possible that files in use will be moved/deleted during reboot.
  • After reboot, post the contents of the log from Dr.Web in your next reply. (You can use Notepad to open the DrWeb.cvs report)

Edited by boopme, 13 June 2009 - 05:04 PM.

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

#11 jdhgoodgrief

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Posted 05 July 2009 - 03:58 PM

Sorry for the delayed response:

A0052650.exe;C:\System Volume Information\_restore{D7DD302A-2A4D-4339-8769-F77CD1F02A90}\RP595;Trojan.Chrome.50;Deleted.;
A0052664.exe;C:\System Volume Information\_restore{D7DD302A-2A4D-4339-8769-F77CD1F02A90}\RP596;Trojan.Botnetlog.9;Deleted.;

#12 boopme

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Posted 05 July 2009 - 09:22 PM

That's OK, How is it running now as I see userinit is gone?
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

#13 jdhgoodgrief

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Posted 06 July 2009 - 04:05 PM

Seems to be running OK now. Thanks so much again for your help.

#14 joseibarra

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Posted 06 July 2009 - 05:58 PM

Hi, boopme:

I have been lurking and learning - these userinit ones are great!

I hvae a curiosity question though, the OP posted a log that in part said:

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


Later, that entry was gone from the report.

I know there has to be a registry entry for userinit and the executable has to be there so I am wondering what did MBAM find and do about it - was the .EXE infected with this Trojan.Dropper, was the infection removed leaving a proper userinit.exe, was the infection in the registry, the executable or both... surely the userinit.exe itself was not deleted.

That trojan might copy userinit.exe to userini.exe and replace the userinit.exe and "drop" one of it's own (I read)... Was that it, you think and MBAM fixed it? Just for that one problem...

Edited by joseibarra, 06 July 2009 - 05:59 PM.

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