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Virus:DR/Zlob.57806.79
Type:Dropper
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:57.806 Bytes
MD5 checksum:85f518cef958232fe659fd9131bec912

 General Aliases:
   •  TrendMicro: TROJ_ZLOB.BQQ
   •  Sophos: Troj/Zlob-US


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


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


Right after execution the following information is displayed:


 Files The following file is created:

%PROGRAM FILES%\MediaCodec\uninst.exe



It tries to download some files:

– The location is the following:
   • http://85.255.114.187/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\fan5.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: HEUR/Malware


– The location is the following:
   • http://85.255.114.187/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\fan6.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://85.255.114.187/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\fan7.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://85.255.114.187/ultra/php/install/**********
It is saved on the local hard drive under: %TEMPDIR%\fan8.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

 Registry The following registry keys are added:

– HKCU\Software\Internet Security
   • "Type"=dword:00000002
   • "Path"="%PROGRAM FILES%\MediaCodec"
   • "Removable"=dword:00000000

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

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\MediaCodec
   • "ProductionEnvironment"="1"
   • "DisplayName"="MediaCodec 4.0"
   • "UninstallString"="%PROGRAM FILES%\MediaCodec\uninst.exe"
   • "DisplayIcon"="%PROGRAM FILES%\MediaCodec\uninst.exe"
   • "DisplayVersion"="4.0"
   • "URLInfoAbout"="www.medcodec.com"
   • "Publisher"="MediaCodec 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 Bogdan Iliuta on Monday, November 13, 2006
Description updated by Bogdan Iliuta on Wednesday, November 15, 2006

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