Virus:TR/Dldr.FraudLoad.51200
Date discovered:16/09/2009
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Medium to high
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:51.200 Bytes
MD5 checksum:2277c47fd42f0D448dab0C97493e6acc
VDF version:7.01.05.247
IVDF version:7.01.05.249 - Wednesday, September 16, 2009

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


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




   Elevates itself with SeShutdownPrivilege in order to restart the system.

 Files It deletes the initially executed copy of itself.



The following files are created:

– %SYSDIR%\braviax.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.Renos.56

– %SYSDIR%\dllcache\figaro.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Rootkit.Gen

– %SYSDIR%\dllcache\beep.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Rootkit.Gen

– %SYSDIR%\drivers\beep.sys Further investigation pointed out that this file is malware, too. Detected as: TR/Rootkit.Gen




It tries to download a file:

– The locations are the following:
   • http://gumertagionader.com/nLp1wa/0t5CVd8hD0u/**********
   • http://celiminerkariota.com/R1J0x5lf8gpn**********
   • http://uplaserdunavats.com/IgJ1JR0JU5a**********
   • http://opolertionfer.com/G1Ce0YTH5**********
   • http://nuherfodaverta.com/Ral1h0T5**********
   • http://polanermogalios.com/Iq1o0p5**********
   • http://vuilertumegated.com/gPq1oKN0**********
   • http://buteratorionasd.com/AYQ1c0sF5n**********
   • http://nulerotkabelast.com/wBd1Tm0L5k**********
Further investigation pointed out that this file is malware, too. Detected as: TR/Dldr.FraudLoad.fnm

 Registry To each registry key one of the values is added in order to run the processes after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "braviax"="%SYSDIR%\braviax.exe"

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "braviax"="%SYSDIR%\braviax.exe"



The value of the following registry key is removed:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • risky



The following registry keys are changed:

Lower security settings from Internet Explorer:
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\
   Associations]
   New value:
   • "LowRiskFileTypes"="zip;.rar;.cab;.txt;.exe;.reg;.msi;.htm;.html;.gif;.bmp;.jpg;.avi;.mov;.mp3;.wav"
   • "SaveZoneInformation"=dword:00000001

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

Description inserted by Petre Galan on Wednesday, September 16, 2009
Description updated by Petre Galan on Wednesday, September 16, 2009

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