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Virus:BDS/Poison.bhtb
Type:Backdoor Server
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Medium
Static file:Yes
File size:141.974 Bytes
MD5 checksum:0533106debc8926d7d927b93255ae66f

 General Methods of propagation:
   • Autorun feature
   • Messenger
   • Peer to Peer


Aliases:
   •  Sophos: Mal/Generic-A
   •  Panda: W32/P2Pworm.HK
   •  Eset: Win32/AutoRun.IRCBot.CX
   •  Bitdefender: Backdoor.Generic.288840


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


Side effects:
   • Drops malicious files
   • Lowers security settings
   • Registry modification
   • Third party control

 Files It copies itself to the following locations:
   • %drive%\wdisvcwks.exe
   • %WINDIR%\wdisvcwks.exe



The following file is created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%




It tries to executes the following files:

– Filename:
   • netsh firewall add allowedprogram wdisvcwks.exe 1 ENABLE


– Filename:
   • "%WINDIR%\wdisvcwks.exe"

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

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Terminal Server\
   Install\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Wks "="wdisvcwks.exe"

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Wks "="wdisvcwks.exe"



It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\AuthorizedApplications\List]
   • "%executed file%"="%executed file%:*:Enabled:Wks "

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It searches for directories that contain one of the following substrings:
   • winmx\shared\
   • tesla\files\
   • limewire\shared\
   • morpheus\my shared folder\
   • emule\incoming\
   • edonkey2000\incoming\
   • bearshare\shared\
   • grokster\my grokster\
   • icq\shared folder\
   • kazaa lite k++\my shared folder\
   • kazaa lite\my shared folder\
   • kazaa\my shared folder\

   If successful, the following files are created:
   • Windows7 keymaker.exe
   • Windows Vista maker.exe
   • Windows Xp SP3 Keygen.exe
   • Msn Messenger.exe
   • Live Messenger.exe
   • Itunes.exe
   • Realplayer.exe
   • Sony Vegas.exe
   • Hack Hotmail.exe


 Messenger It is spreading via Messenger. The characteristics are described below:

– AIM Messenger
– MSN Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: mx.rvs**********.com
Port: 7665
Channel: #Prison-Break2#
Nickname: [CUP|USA|00|P|%number%]

 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 Petre Galan on Wednesday, June 9, 2010
Description updated by Petre Galan on Wednesday, June 9, 2010

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