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Date discovered:21/06/2011
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:38.912 Bytes
MD5 checksum:bd3d6f870dd82bd04d59da8baf2211be
VDF version:
IVDF version:

 General Method of propagation:
   • Autorun feature

   •  Kaspersky:
   •  Bitdefender: Trojan.Generic.5556704
   •  GData: Trojan.Generic.5556704
   •  DrWeb: Trojan.Inject.44684

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

Side effects:
   • Third party control
   • Drops malicious files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following locations:
   • %HOME%\Microsoft-Driver-1-82-8475-5627-5645\winrsvn.exe
   • %drive%\winrsdrv32.exe

The following file is created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

It tries to execute the following file:

– Filename:
   • %HOME%\Microsoft-Driver-1-82-8475-5627-5645\winrsvn.exe

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

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Microsoft(R) Update Service"="%HOME%\Microsoft-Driver-1-82-8475-5627-5645\winrsvn.exe"

It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   • "%HOME%\Microsoft-Driver-1-82-8475-5627-5645\winrsvn.exe"="%HOME%\Microsoft-Driver-1-82-8475-5627-5645\winrsvn.exe:*:Enabled:Microsoft(R)
      Update Service"

 IRC To deliver system information and to provide remote control it connects to the following IRC Servers:

Server: hos**********.net

Server: srv**********.com

 Miscellaneous Mutex:
It creates the following Mutex:
   • J9Zf6Fe67fZTFt

 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 a runtime packer.

Description inserted by Petre Galan on Wednesday, July 6, 2011
Description updated by Petre Galan on Wednesday, July 6, 2011

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