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Date discovered:01/06/2011
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:32.768 Bytes
MD5 checksum:bb6068b96602fa34ac89a3fd1257871e
VDF version:
IVDF version:

 General Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.VB.ahgy
   •  Bitdefender: Trojan.VB.Agent.JD
   •  GData: Trojan.VB.Agent.JD
   •  DrWeb: Trojan.DownLoader3.9975

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following location:
   • %HOME%\Application Data\%executed file%

The following files are created:

– %HOME%\Application Data\winx.dat
– C:\prefs.js

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "sbthost"="%HOME%\Application Data\%executed file%"

The values of the following registry key are removed:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   • AutoConfigURL
   • ProxyOverride
   • ProxyServer

The following registry key is changed:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "MigrateProxy"=dword:0x00000001
   • "ProxyEnable"=dword:0x00000000

 Miscellaneous Accesses internet resources:

 File details Programming language:
The malware program was written in Visual Basic.

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 Tuesday, July 19, 2011
Description updated by Petre Galan on Tuesday, July 19, 2011

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