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Virus:TR/Scar.drdl
Date discovered:04/05/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Medium to high
Damage Potential:Low to medium
Static file:Yes
File size:217.088 Bytes
MD5 checksum:FFAB90D9FF8A94092B0C8B3242EFCAA8
VDF version:7.11.07.146 - Wednesday, May 4, 2011
IVDF version:7.11.07.146 - Wednesday, May 4, 2011

 General Methods of propagation:
   • Autorun feature
   • Messenger


Aliases:
   •  Sophos: Mal/Behav-043
   •  Avast: Win32:AutoRun-BUS
   •  Panda: Trj/CI.A


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


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

 Files It copies itself to the following location:
   • %SYSDIR%\winlgon.exe

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

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

 Messenger It is spreading via Messenger. The characteristics are described below:

– Yahoo Messenger

 Miscellaneous 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 a runtime packer.

Description inserted by Andrei Ilie on Friday, October 7, 2011
Description updated by Andrei Ilie on Monday, October 10, 2011

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