Virus:TR/Dldr.Small.euo
Date discovered:21/08/2008
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:41.476 Bytes
MD5 checksum:889cce4c4ca62c59da2dd397f1b737cd
IVDF version:7.00.06.46 - Thursday, August 21, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan.Win32.Pakes.kdi
   •  F-Secure: Trojan.Win32.Pakes.kdi
   •  Sophos: Troj/Dwnldr-HHB
   •  Panda: Trj/Downloader.UML
   •  VirusBuster: Trojan.Pakes.DJO
   •  Bitdefender: Trojan.Downloader.JKNS


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


Side effects:
   • Downloads malicious files
   • Registry modification

 Files It tries to download some files:

– The location is the following:
   • http://any-pictures.com/**********/item_fdfgi.gif
It is saved on the local hard drive under: %TEMPDIR%\1.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Drop.Agent.eae


– The location is the following:
   • http://bigimagecatalogue.com/**********/hrtzqczuuff.gif
It is saved on the local hard drive under: %TEMPDIR%\2.tmp Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Agent.ryn

 Registry – [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Somefox"="%malware execution directory%\%executed file%"



The following registry keys are added:

– [HKLM\Software\Microsoft\RFC1156Agent\CurrentVersion\Parameters]
   • "TrapPollTimeMilliSecs"=dword:%hex number%

– [HKLM\SOFTWARE\Mozilla\Somefox]
   • "Str4265778"="mg=="
   • "Str4"=""
   • "Str1"="%random character string%"
   • "Str0"="%random character string%"
   • "Int2"=dword:%hex number%
   • "Int3"=dword:%hex number%

 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 the following runtime packer:
   • PECompact

Description inserted by Andreas Feuerstein on Wednesday, December 17, 2008
Description updated by Andreas Feuerstein on Wednesday, December 17, 2008

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