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Virus:TR/Algaloeb.A
Date discovered:24/06/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Medium to high
Damage Potential:Low to medium
Static file:Yes
File size:90.112 Bytes
MD5 checksum:DE50C0444263F1B4E041E7C5F40C18AE
VDF version:7.11.10.86 - Friday, June 24, 2011
IVDF version:7.11.10.86 - Friday, June 24, 2011

 General Methods of propagation:
   • Autorun feature
   • Messenger


Aliases:
   •  Kaspersky: Trojan.Win32.VBKrypt.drrf
   •  TrendMicro: TROJ_VBKRYPT.XH
   •  Microsoft: Worm:Win32/Nusump


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 location:
   • %TEMPDIR%\%random character string%.exe



It deletes the initially executed copy of itself.

 Registry The following registry key is added:

– [HKLM\SOFTWARE\Microsoft\Active Setup\Installed Components\
   {254F4E25-A65F-2764-0003-070806050704}]
   • "StubPath"="%TEMPDIR%\%random character string%.exe"

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

– Windows Live Messenger

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • %WINDIR%\explorer.exe


 Miscellaneous Accesses internet resources:
   • **********mond.serveblog.net

 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 Tuesday, October 4, 2011
Description updated by Andrei Ilie on Wednesday, October 5, 2011

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