Virus:TR/Dldr.Winlagons.BN
Date discovered:07/04/2008
Type:Trojan
Subtype:Downloader
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:3.009 Bytes
MD5 checksum:a018dc8d6710e1511c1a26d27c2e8b93
IVDF version:7.00.03.123 - Monday, April 7, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Winlagons.bn
   •  F-Secure: Trojan-Downloader.Win32.Winlagons.bn
   •  Eset: Win32/TrojanDownloader.Tiny.NJ trojan
   •  Bitdefender: Trojan.Downloader.Tipikit.F


Platforms / OS:
   • 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://58.65.239.115/**********/tpktskr2.php
It is saved on the local hard drive under: %SYSDIR%\jhwqzy.tmp This file may contain further download locations and might serve as source for new threats.

– The location is the following:
   • http://58.65.239.42/**********/gdk5.exe
It is saved on the local hard drive under: %SYSDIR%\iegm563.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Dropper.Gen


– The location is the following:
   • http://58.65.239.42/**********/wejhfds.exe
It is saved on the local hard drive under: %SYSDIR%\iegm563.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: Worm/Zhelatin.YO.165

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\Google Online Services]
   • "Type"=dword:00000110
     "Start"=dword:00000002
     "ErrorControl"=dword:00000000
     "ImagePath"=%malware execution directory%\%executed file%
     "DisplayName"="Google Online Services"
     "ObjectName"="LocalSystem"

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • FSG

Description inserted by Thomas Wegele on Thursday, May 15, 2008
Description updated by Thomas Wegele on Thursday, May 15, 2008

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