Worm:W32/AutoRun.NOI

Classification

Malware

Worm

W32

W32/Autorun-jl (Sophos), Generic.dx trojan (McAfee), WORM_AUTORUN.RC (Trend Micro), W32.SillyFDC (Symantec), Worm:Win32/Emold.C (Microsoft)

Summary

A standalone malicious program which uses computer or network resources to make complete copies of itself.

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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Submit a sample

Submit a file or URL for further analysis.

Technical Details

Worm.Win32.AutoRun.noi creates a copy of itself as the following:

  • C:\Program Files\Microsoft Common\wuauclt.exe

It creates the following registry key:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeDebugger = "%ProgramFiles%\Microsoft Common\wuauclt.exe

Note: The key is created for automatic execution when explorer.exe is launched.

It also drops two files into the root of available removable drives:

  • autorun.inf
  • system.exe

It then injects codes to explorer.exe.

The autorun.inf file is an autorun file of system.exe and contains the following strings:

  • [autorun]open=system.exeshellexecute=system.exeshell\Explore\command=system.exeshell\Open\command=system.exeshell=Explore

Worm.Win32.AutoRun.noi attempts to retrieve information from:

  • http://druzg.ru/[...].php?v=1&rs=13441600&n=1&uid=1
  • http://drizg.ru/[...].php?v=1&rs=13441600&n=1&uid=1

The worm uses rootkit stealth techniques to hide its presence on the infected machine, including deleting its own installation file once the installation has been completed.

Date Created: 2008-10-17 11:32:14.0

Date Last Modified: 2008-10-17 12:29:43.0