Virus:TR/Drop.RKit.BI
Date discovered:25/07/2008
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:40.960 Bytes
MD5 checksum:89601577d78bf4f507cf1bb2bcc38d95
IVDF version:7.00.05.168 - Friday, July 25, 2008

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Symantec: Trojan.Fakeavalert
   •  Mcafee: FakeAlert-AT trojan
   •  Kaspersky: Hoax.Win32.Renos.vaqx
   •  F-Secure: Hoax.Win32.Renos.vaqx
   •  Sophos: Troj/Spywad-AZ
   •  Panda: Adware/VapSup
   •  Grisoft: Downloader.FraudLoad.C
   •  Eset: Win32/Adware.UltimateDefender application
   •  Bitdefender: Trojan.Crypt.EQ


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files It deletes the initially executed copy of itself.



The following files are created:

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

– %SYSDIR%\braviax.exe Furthermore it gets executed after it was fully created. Detected as: TR/Dldr.Ag.KLI.9216

– %WINDIR%\delself.bat Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

 Registry The following registry keys are added in order to run the processes after reboot:

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

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

 File details Programming language:
 The malware program was written in MS Visual C++.

Description inserted by Thomas Wegele on Wednesday, August 27, 2008
Description updated by Thomas Wegele on Wednesday, August 27, 2008

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