Virus:TR/Drop.Ag.abu.21.B
Date discovered:02/02/2006
Type:Trojan
Subtype:Dropper
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:448.512 Bytes
MD5 checksum:e72d48b5cb4d67c5887f402752e3ca18
VDF version:6.33.00.183

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Mcafee: Proxy-Raser.dr
   •  Kaspersky: Trojan-Dropper.Win32.Agent.abu
   •  Sophos: Troj/Raser-Z
   •  Bitdefender: Trojan.Proxy.C


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Drops malicious files
   • Registry modification

 Files The following files are created:

– A file that is for temporary use and it might be deleted afterwards:
   • %SYSDIR%\wesf

– %SYSDIR%\msupdate32.dll Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TRSpy.Agent.abu.DLL

– %SYSDIR%\mspostsp.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Inject.I.4

 File details Programming language:
 The malware program was written in Delphi.


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 Daniel Constantin on Wednesday, March 1, 2006
Description updated by Daniel Constantin on Wednesday, March 8, 2006

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