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Virus:TR/GruenFink.5
Date discovered:10/10/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:643.072 Bytes
MD5 checksum:309ede406988486bf81e603c514b4b82
VDF version:7.11.15.203 - Monday, October 10, 2011
IVDF version:7.11.15.203 - Monday, October 10, 2011

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Dropper.Win32.Agent.fymy
   •  F-Secure: Backdoor:W32/R2D2.A
   •  Sophos: Troj/BckR2D2-A
   •  Microsoft: Backdoor:Win32/R2d2.A
   •  Eset: Win32/R2D2.B
   •  AhnLab: Win-Trojan/Injector.643072.AA
   •  DrWeb: Trojan.DownLoader3.20874


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


Side effects:
   • Third party control
   • Can be used to execute malicious code
   • Drops malicious files
   • Records keystrokes
   • Steals information

 Files The following files are created:

%SYSDIR%\mfc42ul.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/GruenFink.1

%SYSDIR%\winsys32.sys Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/GruenFink.2

%TEMPDIR%\~acrd~tmp~.exe Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/GruenFink.4

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

– [HKLM\SYSTEM\ControlSet001\Services\winsys32]
   • "ImagePath"="%SYSDIR%\winsys32.sys"

– [HKLM\SYSTEM\CurrentControlSet\Services\winsys32]
   • "ImagePath"="%SYSDIR%\winsys32.sys"

Description inserted by Eric Burk on Tuesday, October 11, 2011
Description updated by Eric Burk on Tuesday, October 11, 2011

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