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Virus:TR/Vilsel.nvw
Date discovered:27/11/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:34.816 Bytes
MD5 checksum:10a39c8fdb1d9fcfe463616396df0010
IVDF version:7.10.01.112 - Friday, November 27, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Sophos: Troj/Agent-LVZ
   •  Panda: W32/Autorun.JQE
   •  Eset: Win32/AutoRun.FakeAlert.DN
   •  Bitdefender: Trojan.Hiloti.AS


Platforms / OS:
   • 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:
   • %PROGRAM FILES%\Microsoft Common\svchost.exe
   • %drive%\system.exe



The following file is created:

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




It tries to download a file:

– The locations are the following:
   • http://hohiserdert.com/ld2/**********?v=1&rs=55274-641-2040627-231514230819808&n=1&uid=1
   • http://193.104.27.235/ld2/**********?v=1&rs=55274-641-2040627-231514230819808&n=1&uid=1
   • http://193.104.27.234/ld2/**********?v=1&rs=55274-641-2040627-231514230819808&n=1&uid=1
Further investigation pointed out that this file is malware, too.

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
   Image File Execution Options\explorer.exe]
   • "Debugger"="%PROGRAM FILES%\Microsoft Common\svchost.exe"

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

Description inserted by Petre Galan on Friday, March 12, 2010
Description updated by Petre Galan on Monday, March 15, 2010

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