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Date discovered:24/08/2010
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:75.776 Bytes
MD5 checksum:E169A143BE66E65FD96F8125BC116BDE
VDF version:
IVDF version:

 General Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Obfuscated.zcq
   •  Microsoft: Trojan:Win32/Sisron
   •  AhnLab: Win-Trojan/Sisron.75776
   •  DrWeb: Trojan.VbCrypt.28

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7

Side effects:
   • Drops files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\scvhost.exe
   • %SYSDIR%\cftmon.exe

 Registry One of the following values is added in order to run the process after reboot:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "cftmon"="\"%SYSDIR%\cftmon.exe\""

The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\WMOptimizer]
   • "Type"=dword:00000110
   • "Start"=dword:00000002
   • "ErrorControl"=dword:00000001
   • "ImagePath"="%SYSDIR%\scvhost.exe service"
   • "DisplayName"="Windows Media Optimizer"
   • "ObjectName"="LocalSystem"
   • "XVer"=dword:00000004

The following registry key is changed:

Various Explorer settings:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "ShowSuperHidden"=dword:00000000

 Miscellaneous Accesses internet resources:

Anti debugging
Checks for debugger or virtual machine using time related techniques.

 File details Programming language:
The malware program was written in MS Visual C++.

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 Andrei Ilie on Monday, October 3, 2011
Description updated by Andrei Ilie on Tuesday, October 4, 2011

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