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Date discovered:18/01/2006
In the wild:Yes
Reported Infections:Medium to high
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:10.752 Bytes
MD5 checksum:8672efe223437bf28c3fb5c4135e0709
VDF version:

 General Method of propagation:
   • No own spreading routine

   •  Mcafee: Downloader-AAP
   •  Kaspersky: Trojan-Downloader.Win32.Vidlo.y
   •  TrendMicro: TROJ_YABE.I
   •  Sophos: Troj/Vidlo-C
   •  Panda: Trj/Downloader.HFZ
   •  Bitdefender: Trojan.SSODL.A

Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003

Side effects:
   • Downloads malicious files
   • Drops a malicious file
   • Registry modification

 Files It deletes the initially executed copy of itself.

The following files are created:

– Non malicious file:
   • %SYSDIR%\dllsys.dll

%SYSDIR%\sysldr.dll Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Goldun.FN.4

It tries to download a file:

– The locations are the following:
This file may contain further download locations and might serve as source for new threats.

 Registry The value of the following registry key is removed:

–  [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]
   • sysldr

The following registry keys are added:

– [HKCR\CLSID\{%generated CLSID%}\InprocServer32]
   • @="sysldr.dll"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
   • "sysldr"="{%generated CLSID%}"

 Injection –  It injects the following file into a process: %SYSDIR%\sysldr.dll

    Process name:

Description inserted by Andrei Ivanes on Thursday, January 19, 2006
Description updated by Andrei Ivanes on Thursday, January 19, 2006

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