Threat description


Category: Malware
Type: Trojan-Spy
Platform: W32
Date Discovered: September 12, 2006
Aliases: BZub.DO


BZub.DO, a variant of BZub, is a Trojan. BZub.DO creates files in the Windows directory and steals logins, passwords, PINs, check words and other info related to logging to bank websites.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.


More information on scanning and removal options available in your F-Secure product can be found in the Help Center.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

The BZub.DO trojan was spammed to a large number of people as an attachment to an e-mail message. The attachment name was rakningen.exe, the same file name that was recently used for a spammed variant of Haxdoor backdoor. The trojan drops a keylogger and spies against users of several banks.After being run by the user, the trojan drops three files to the Window System folder. The dropped files represent the main spying component (ipv6monl.dll) and a keylogger (msn.exe and hook.dll). Both spying components are registered to start with every Windows session and remain active in memory at all times. The main spying component steals information related to various on-line banking accounts. Customers of the following banks and on-line payment systems may be affected:

  • Barklays
  • E-Gold
  • Intelligent Finance
  • Nationwide's Internet Bank
  • Postbank

The trojan also steals the following info and sends it to a hacker:

  • HTTP mail password
  • HTTP mail user name
  • IE autocomplete fields data
  • IE protected storage data
  • MSN Explorer signup data
  • Outlook account passwords
  • POP server name
  • POP server password
  • POP server user name
  • SMTP e-mail address

The keylogger records all keystrokes on an infected computer and sends the stolen info to the hacker.


Detection Type: PC
Database: 2006-09-12_09


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