Worm:W32/Autorun.GA

Classification

Malware

Worm

W32

-

Summary

A standalone malicious program which uses computer or removable drives 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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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

AutoRun.GA creates a copy of itself as the following:

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

It will change the title of the process to "notepad window".

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

  • autorun.inf
  • wuauclt.exe

It injects codes to svchost.exe and explorer.exe.

It looks for a service that will run manually and then temporarily replaces the driver with malicious driver. It then runs the service and the returns the original driver.

Launchpoint

  • Key: HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeValue: DebuggerData: C:\Program Files\Microsoft Common\wuauclt.exe

This entry is created for automatic execution when explorer.exe is launched.

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

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

Stealth

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.

File System Changes

Creates these files:

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

Process Changes

Writes in memory of these processes:

  • svchost.exe
  • explorer.exe

Network Connections

Attempts to connect to:

  • http://aaszxt.ru/load4/[...].php?v=1&rs=%u&uid=1
  • http://aaszxt.ru/load4/[...].php?v=1&id=%s&rs=%u&cc=0&uid=1
  • http://aaszxt.ru/load4/[...].php?v=1&rs=%u&n=1&uid=1
  • http://aaszxt.ru/load4/[...].php?v=1&id=%s&rs=%u&n=1&cc=0&uid=1
  • http://aaszxr.ru/loadx/[...].php?v=1&rs=%u&uid=1
  • http://aaszxr.ru/loadx/[...].php?v=1&id=%s&rs=%u&cc=0&uid=1
  • http://aaszxr.ru/loadx/[...].php?v=1&rs=%u&n=1&uid=1
  • http://aaszxr.ru/loadx/[...].php?v=1&id=%s&rs=%u&n=1&cc=0&uid=1

Registry Modifications

Sets these values:

  • HKLM\Software\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\explorer.exeDebuggerC:\Program Files\Microsoft Common\wuauclt.exe

Date Created: 2008-09-10 04:00:48.0

Date Last Modified: 2008-09-10 17:52:27.0