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Sophos Anti-Rootkit creates a temporary executable in Local Settings\Temp?


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#1 sophiaXP

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Posted 11 November 2010 - 01:34 PM

For example Local Settings\Temp\sssahoi.exe will be created and launched but dies when you quit the sophos scanner. The next time the file name will be another random name like avassv.exe.

Is this normal? I downloaded it and it was scanned clean at http://virusscan.jotti.org/.

Anyone knows if this is normal or not?

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#2 boopme

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Posted 11 November 2010 - 02:02 PM

Hi, I don't think they are Sophos' files.. Did Jotti show they were?

Are you running XP?


Clean the Temp files. TFC by OT
Please download TFC by Old Timer and save it to your desktop.
alternate download link

Save any unsaved work. TFC will close ALL open programs including your browser!
Double-click on TFC.exe to run it. If you are using Vista, right-click on the file and choose Run As Administrator.
Click the Start button to begin the cleaning process and let it run uninterrupted to completion.
Important! If TFC prompts you to reboot, please do so immediately. If not prompted, manually reboot the machine anyway to ensure a complete clean.


Next run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware and save it to your desktop.
Download Link 1
Download Link 2MBAM 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.
    For instructions with screenshots, please refer to the How to use Malwarebytes' Anti-Malware Guide.
  • 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.

Troubleshoot Malwarebytes' Anti-Malware

Edited by boopme, 11 November 2010 - 02:03 PM.

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#3 quietman7

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Posted 11 November 2010 - 04:27 PM

When performing a scan with Sophos Anti-Rootkit, it will create an .exe file with a random name (i.e. kwtfbh.exe, tqwjlz.exe) in the C:\Documents and Settings\<user profile>\Local Settings\Temp\ folder. This is behavior by design intended to prevent some types of malware from detecting and stopping Sophos from running. The file should have the same date as the files created in the Sophos folder.

Sophos also installs MEMSWEEP.sys in its installation folder and creates a randomly named temporary file (i.e. 1EE5.tmp) in the C:\Windows\system32 folder which may be detected by some security real-time protection programs when starting a scan.
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#4 quietman7

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Posted 11 November 2010 - 04:42 PM

I forgot to add that a new randomly named .exe file will be created on each subsequent scan.
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