This IRC-based backdoor-worm was found on August 16th, 2005. The backdoor provides unauthorised access to an infected computer and also has the capability to spread to remote computers using the PNP exploit.
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The executable is a file of around 10KB.
When the backdoor's file is activated on a computer, it copies its file to Windows System folder as wintbp.exe and then starts the copied file. Then it adds the following registry entries to ensure that it is started when a user logs on or the system is restarted:
[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] "Wintbp" = "wintbp.exe"
The backdoor connects to IRC server 220.127.116.11, joins an IRC channel called '#tbp' and creates a bot there.
The backdoor has the ability to spread to remote computers using the PNP exploit on port 445. If the attack is successful a shell (cmd.exe) is started on port 8594. Through the shell port, the worm sends a tftp script which instructs the remote computer to download and execute the worm from the attacker computer using built-in TFTP server listening on port 69.
Here's the summary of the ports used in attack:
Please see the following page for detailed information on the vulnerability: