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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 - Friday, July 4, 2008

 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.

Descrizione inserita da Thomas Wegele su mercoledì 27 agosto 2008
Descrizione aggiornata da Thomas Wegele su mercoledì 27 agosto 2008

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