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Virus:TR/VBKrypt.djnz
Date discovered:14/06/2011
Type:Trojan
In the wild:No
Reported Infections:Low
Distribution Potential:Medium to high
Damage Potential:Medium
Static file:Yes
File size:114.688 Bytes
MD5 checksum:5721F754F350A66DF20C9761F79309EC
VDF version:7.11.09.169 - Tuesday, June 14, 2011
IVDF version:7.11.09.169 - Tuesday, June 14, 2011

 General Methods of propagation:
   • Autorun feature
   • Messenger


Aliases:
   •  TrendMicro: WORM_DORKBOT.AE
   •  Sophos: Troj/Agent-SAD
   •  Microsoft: Worm:Win32/Dorkbot.K


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows 7


Side effects:
   • Third party control
   • Drops files
   • Registry modification

 Files It copies itself to the following location:
   • %APPDATA%\%random character string%.exe

 Registry One of the following values is added in order to run the process after reboot:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "%random character string%"="%APPDATA%\%random character string%.exe"



The following registry key is changed:

Lower security settings from Internet Explorer:

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   New value:
   • "MigrateProxy"=dword:00000001
   • "ProxyEnable"=dword:00000000
   • "ProxyServer"=-
   • "ProxyOverride"=-
   • "AutoConfigURL"=-

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

– Windows Live Messenger

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

Server: **********boflaco.com
Port: 1063
Server password: ngrBot
Channel: #rootcrazy
Nickname: %random character string%
Password: rambomarica

Server: **********bogordo.com
Port: 1063
Server password: ngrBot
Channel: #rootcrazy
Nickname: %random character string%
Password: rambomarica

Server: **********boviejo.com
Port: 1063
Server password: ngrBot
Channel: #rootcrazy
Nickname: %random character string%
Password: rambomarica



– This malware has the ability to collect and send information such as:
    • Platform ID
    • Information about the Windows operating system


– Furthermore it has the ability to perform actions such as:
    • connect to IRC server
    • disconnect from IRC server
    • Join IRC channel
    • Leave IRC channel
    • Visit a website

 Injection It is injected into all processes.


 Miscellaneous Accesses internet resources:
   • api.wipmania.com

 File details Programming language:
The malware program was written in Visual Basic.


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

Description inserted by Andrei Ilie on Tuesday, September 20, 2011
Description updated by Andrei Ivanes on Friday, November 18, 2011

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