Virus:TR/Dldr.Agent.aizj
Date discovered:08/10/2008
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:181.536 Bytes
MD5 checksum:693da45a090f56bd6817c7244573b29d
IVDF version:7.00.07.09 - Wednesday, October 8, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Agent.aizj
   •  TrendMicro: TROJ_DROPPER.KGC
   •  F-Secure: Trojan-Downloader:W32/Banload.FUF
   •  Sophos: Troj/Dloadr-BUR
   •  Grisoft: Downloader.Agent.AMNS
   •  Bitdefender: Trojan.Agent.Delf.ND


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


Side effects:
   • Downloads a file
   • Downloads a malicious file

 Files The following file is created:

– Temporary files that might be deleted afterwards:
   • %temporary internet files%\Content.IE5\%eight-digit random character string%\sub1[1].gif
   • %temporary internet files%\Content.IE5\%eight-digit random character string%\sub[1].gif




It tries to download some files:

– The location is the following:
   • http://71.125.18.24/**********/sub1.gif
It is saved on the local hard drive under: %SYSDIR%\microsoftupdate.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Banload.wjk


– The location is the following:
   • http://83.140.184.152/**********/sub.gif
It is saved on the local hard drive under: %SYSDIR%\00.0

 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 a runtime packer.

Description inserted by Andreas Feuerstein on Thursday, October 9, 2008
Description updated by Andreas Feuerstein on Thursday, October 9, 2008

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