Virus:TR/Dldr.Beux.A
Date discovered:06/08/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Low
Static file:Yes
File size:910.336 Bytes
MD5 checksum:42ce5b2fa255f650192031e143bc3a45
IVDF version:7.10.10.101 - Friday, August 6, 2010

 General Method of propagation:
   • No own spreading routine


Alias:
   •  AVG: Generic2_c.BEUX


Platforms / OS:
   • Windows 98
   • Windows 98 SE
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7


Side effects:
   • Downloads malicious files
   • Registry modification

 Files It tries to download some files:

– The location is the following:
   • http://www.f**********pg
It is saved on the local hard drive under: %TEMPDIR%\%randomly chosen directory%\avgkill.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too. Detected as: TR/Spy.Spy.Beux.B


– The location is the following:
   • http://www.fr**********ia.exe
It is saved on the local hard drive under: %TEMPDIR%\%randomly chosen directory%\hotjulia.EXE Furthermore this file gets executed after it was fully downloaded. At the time of writing it was an updated version of the malware itself. Detected as: TR/Dldr.Beux.B

 Registry The following registry key is added:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce]
   • "wextract_cleanup0"="rundll32.exe %SYSDIR%\advpack.dll,DelNodeRunDLL32 "%TEMPDIR%\%randomly chosen directory%\""

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

Description inserted by Carlos Valero Llabata on Monday, August 9, 2010
Description updated by Carlos Valero Llabata on Monday, August 9, 2010

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