Virus:TR/Zlob.65745.8
Date discovered:25/10/2006
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:49.803 Bytes
MD5 checksum:eea22afe223ef4c31fd0442281eaae61
VDF version:6.36.00.166
IVDF version:6.36.00.184 - Monday, October 30, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  F-Secure: Trojan-Downloader.Win32.Zlob.aqo
   •  Grisoft: Downloader.Zlob.CX
   •  Eset: Win32/TrojanDownloader.Zlob


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


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


Right after execution the following information is displayed:



 Files  It creates the following directory:
   • %PROGRAM FILES%\VideoCompressionCodec



The following file is created:

– %PROGRAM FILES%\VideoCompressionCodec\uninst.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Zlob.65745.8




It tries to download some files:

– The location is the following:
   • 85.255.118.2/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\laf%hex number%.tmp Furthermore this file gets executed after it was fully downloaded.

– The location is the following:
   • yourguardonline.biz/**********
It is saved on the local hard drive under: %TEMPDIR%\laf%hex number%.tmp Furthermore this file gets executed after it was fully downloaded. This file may contain further download locations and might serve as source for new threats.

– The location is the following:
   • 85.255.118.2/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\laf%hex number%.tmp Furthermore this file gets executed after it was fully downloaded.

 Registry The following registry keys are added:

– [HKCU\Software\Internet Security]
   • "Type"=dword:00000003
   • "Path"="%PROGRAM FILES%\VideoCompressionCodec"
   • "Removable"=dword:00000000

– [HKCR\VSEnchancer.Chl]
– [HKCR\VSEnchancer.Chl\CLSID]
   • @="{6BF52A52-394A-11D3-B153-00C04F79FAA6}"

– [HKCR\AVZipEnchancer.Chl]
– [HKCR\AVZipEnchancer.Chl\CLSID]
   • @="{6BF52A52-394A-11D3-B153-00C04F79FAA6}"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\
   VideoCompressionCodec]
   • "ProductionEnvironment"="1"
   • "DisplayName"="VideoCompressionCodec 10.0"
   • "UninstallString"="%PROGRAM FILES%\VideoCompressionCodec\uninst.exe"
   • "DisplayIcon"="%PROGRAM FILES%\VideoCompressionCodec\uninst.exe"
   • "DisplayVersion"="10.0"
   • "URLInfoAbout"="www.vccodec.com"
   • "Publisher"="VideoCompressionCodec Software"

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

Description inserted by Adriana Popa on Monday, November 13, 2006
Description updated by Adriana Popa on Tuesday, November 21, 2006

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