Worm:W32/AutoIt.Q

Classification

Malware

Worm

W32

Win32.Worm.AutoIt

Summary

This malware spreads by copying itself to removable devices and replacing the autorun.inf of the device with its own copy to ensure automatic execution.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

Knowledge Base

Find the latest advice in our Community Knowledge Base.

User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

The file called suicide.bat is an installation helper file that deletes the original malware file. It performs a ping loopback on the system to check for the presence of a functioning network card.After completing its routine, the batch file deletes itself.

File System Changes

Creates these files:

  • %windir%\system32\csrcs.exe
  • %temp%\suicide.bat

Modified these files:

  • %temp%\aut1.tmp
  • %temp%\
  • %temp%\aut2.tmp
  • %temp%\

Process Changes

Creates these processes:

  • %windir%\system32\csrcs.exe
  • %windir%\system32\cmd.exe
  • %windir%\system32\ping.exe

Creates these mutexes:

  • 6E523163793968624

Registry Modifications

Sets these values:

  • HKLM\Software\Microsoft\DRM\amty ilop = 1
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\4\MUICache\ C:\WINDOWS\system32\csrcs.exe =
  • HKLM\Software\Microsoft\Windows\CurrentVersion\policies\Explorer\Run csrcs = C:\WINDOWS\system32\csrcs.exe
  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon Shell = Explorer.exe csrcs.exe
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced Hidden = 4718592
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced SuperHidden = 4718706
  • HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced ShowSuperHidden = 4718706
  • HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL CheckedValue = 6553701
  • HKLM\Software\Microsoft\DRM\amty fix =
  • HKLM\Software\Microsoft\DRM\amty fix1 = 1

Creates these keys:

  • HKLM\Software\Microsoft\DRM\amty