Worm/Autorun.ehx - Worm

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Summary

Full description

Statistics

Virus:	Worm/Autorun.ehx
Date discovered:	04/07/2008
Type:	Worm
In the wild:	Yes
Reported Infections:	Low to medium
Distribution Potential:	Low
Damage Potential:	Medium
Static file:	Yes
File size:	113.731 Bytes
MD5 checksum:	4594ad377b48a60ce6c104b74407373d
IVDF version:	7.00.05.47 - Fri, 04 Jul 2008 09:51 (GMT+1)

General Method of propagation:
   • Mapped network drives

Aliases:
   • Symantec: Trojan.Packed.NsAnti
   • Kaspersky: Worm.Win32.AutoRun.ehx
   • F-Secure: Worm.Win32.AutoRun.ehx
   • Sophos: Mal/EncPk-CE
   • Panda: W32/Lineage.IYF.worm
   • VirusBuster: Worm.AutoRun.BAA
   • Eset: Win32/PSW.OnLineGames.NMY trojan
   • Bitdefender: Trojan.PWS.OnlineGames.ZPE

Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Registry modification

Files It copies itself to the following locations:
   • %SYSDIR%\amvo.exe
   • C:\xmnm2.cmd

It deletes the initially executed copy of itself.

The following files are created:

– C:\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

– %TEMPDIR%\ovk2o.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

– %SYSDIR%\amvo0.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Vundo.Gen

– %SYSDIR%\drivers\vga.sys Further investigation pointed out that this file is malware, too. Detected as: Rkit/Vanti.hl.1

It tries to download a file:

– The location is the following:
   • http://www.aabb1122.com/**********/help.exe
It is saved on the local hard drive under: %TEMPDIR%\help.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Crypt.XPACK.Gen

Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SYSTEM\ControlSet001\Services\KAVsys]
   • "Type"=dword:00000001
   • "ErrorControl"=dword:00000001
   • "Start"=dword:00000001
   • "ImagePath"="\??\%SYSDIR%\drivers\vga.sys"

File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

See a brief description here.

Description inserted by Thomas Wegele on Wed, 27 Aug 2008 12:49 (GMT+1)
Description updated by Thomas Wegele on Wed, 27 Aug 2008 13:03 (GMT+1)

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