Virus:TR/Dldr.Agent.atym
Date discovered:12/12/2008
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:31.232 Bytes
MD5 checksum:b617818c32d17ab487ef661b834fb8e1
IVDF version:7.01.00.227 - Friday, December 12, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Agent.atym
   •  F-Secure: Trojan-Downloader.Win32.Agent.atym
   •  Grisoft: Downloader.Agent.AQDB
   •  Eset: a variant of Win32/Kryptik.CV trojan


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


Side effects:
   • Downloads a malicious file

 Files It tries to download a file:

– The location is the following:
   • http://79.143.177.43/**********/95/416/file.exe
It is saved on the local hard drive under: %temporary internet files%\%random character string%.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: BDS/TDSS.aen

 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 Thomas Wegele on Tuesday, December 16, 2008
Description updated by Thomas Wegele on Tuesday, December 16, 2008

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