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SHeur2 trojan


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#1 trevbetts

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Posted 28 May 2010 - 05:13 PM

Has anyone experienced this trojan or one of the many similar ones?
What's the most effective product or procedure?
I have a SHeur2 trojan infection on a computer running XP professional. The computer has never been connected to the internet and does not currently have a firewall running or virus protection. The trojan was hidden in a K-lite codec pack. I know because the only recent external connection to the computer was a USB memory stick I used to add the latest K-lite mega codec pack. I added the codec pack to enable MP4 viewing in Windows media player. I found out that the computer was infected when I next used the USB memory stick on a different computer running AVG v9 virus protection. AVG immediately identified SHeur2.CNAM on the memory stick. It was in several computer backup folders and had placed several hidden files "tgt.exe". AVG dealt with the problem easily, presumably because the trojan had not had a chance to be deployed on that computer.
I have checked the "infected" computer. A search for "tgt.exe" finds it in several places, all are hidden files. The trojan has de-activated the "show hidden files" option in folder options to prevent them being seen. they can be deleted but will reappear when any media player is used. I have not investigated further as there is no doubt that the trojan is present.
I have dealt with trojans before but it usually involves numerous attempts and unplanned cockups. So, before I tinker, I thought I would see if I could follow someone else's success. I am prepared to connect the computer to the internet re appropriate downloads etc but am loath to do so unless absolutely necessary.

trevbetts

EDIT: Moved from XP to more appropriate Am I Infected forum ~ Hamluis.

Edited by hamluis, 28 May 2010 - 06:19 PM.


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#2 boopme

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Posted 28 May 2010 - 09:49 PM

Hello. This will should clean with a couple tools and maybe a few reruns. Also you will need to clean the USB as it will infect every PC it connects to.
What is the operating sytem? one should at least have the Windows firewall running and a free AV.

Next run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware (v1.46) and save it to your desktop.alternate download link 1
alternate download link 2
MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
MBAM will automatically start and you will be asked to update the program before performing a scan.
  • If an update is found, the program will automatically update itself. Press the OK button to close that box and continue.
  • If you encounter any problems while downloading the definition updates, manually download them from here and just double-click on mbam-rules.exe to install.
On the Scanner tab:
  • Make sure the "Perform Quick Scan" option is selected.
  • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
Back at the main Scanner screen:
  • Click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.
Next run ATF and SAS: If you cannot access Safe Mode,run in normal ,but let me know.

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.



Flash_Disinfector is a specialized fix tool created by sUBs to remove infections that load an autorun.inf file on removable media. Flash_Disinfector will create a hidden "dummy" autorun folder/file with special permissions in each partition and every external drive that was connected when the tool was run. This folder helps to keep the malicious autorun.ini file from being installed on the root drive and running other malicious files which will infect the computer

Please download Flash_Disinfector.exe by sUBs and save it to your desktop.
  • Double-click Flash_Disinfector.exe to run it and follow any prompts that may appear.
  • The utility may ask you to insert your flash drive and/or other removable drives. Please do so and allow the utility to clean up those drives as well.
  • Hold down the Shift key when inserting the drive until Windows detects it to keep autorun.inf from executing if it is present.
  • Wait until it has finished scanning and then exit the program.
  • Reboot your computer when done.
Note: As part of its routine, Flash_Disinfector will create a hidden folder named autorun.inf in each partition and every USB drive that was plugged in when you ran it. Do not delete this folder...it will help protect your drives from future infection by keeping the autorun file from being installed on the root drive and running other malicious files.
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