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Virus:TR/VBKrypt.ctyp
Date discovered:21/04/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Medium
Damage Potential:Low to medium
Static file:Yes
File size:201.216 Bytes
MD5 checksum:b17691741cbc89df1cab72437372471e
VDF version:7.11.06.229 - Thursday, April 21, 2011
IVDF version:7.11.06.229 - Thursday, April 21, 2011

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


Aliases:
   •  Kaspersky: Trojan.Win32.VBKrypt.ctyp
   •  Bitdefender: Trojan.Generic.KD.196264
   •  GData: Trojan.Generic.KD.196264
   •  DrWeb: Trojan.Inject.49477


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


Side effects:
   • Drops malicious files
   • Registry modification
   • Steals information

 Files It copies itself to the following locations:
   • %drive%\nvapbar.exe
   • %recycle bin%\%CLSID%\nvapbar.exe



The following files are created:

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

 Registry The following registry key is added in order to run the process after reboot:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   • "Taskman"="%recycle bin%\%CLSID%\nvapbar.exe"

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:   It retrieves shared folders by querying the following registry keys:
   • Software\BearShare\General
   • Software\iMesh\General
   • Software\Shareaza\Shareaza\Downloads
   • Software\Kazaa\LocalContent
   • Software\DC++
   • Software\eMule
   • Software\Microsoft\Windows\CurrentVersion\Uninstall\eMule Plus_is1

   It searches for directories that contain the following substring:
   • \Local Settings\Application Data\Ares\My Shared Folder


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

– Windows 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.

 Backdoor Contact server:
All of the following:
   • ChatAddiction.Ser**********.com:3555 (UDP)
   • utgameserver325.ope**********.be:3555 (UDP)
   • Windowsmedia.ne**********.in:3555 (UDP)


 Stealing It tries to steal the following information:
– Recorded passwords used by the AutoComplete function

– Passwords from the following programs:
   • Mozilla Firefox
   • Internet Explorer

 Injection – It injects itself as a remote thread into a process.

    Process name:
   • explorer.exe


 Miscellaneous Mutex:
It creates the following Mutex:
   • xxx_fejh__frg65fx

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


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 Monday, July 18, 2011
Description updated by Petre Galan on Monday, July 18, 2011

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