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.

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Knowledge Base

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User Guide

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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

Date Created: 2008-11-23 19:14:16.0

Date Last Modified: 2010-05-24 06:00:37.0