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.
Disinfection
F-Secure provides the special disinfection utility to eliminate
this malware infection. You can download this utility from our
ftp or web sites:
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:
The backdoor connects to IRC server 72.20.27.115, 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:
Port 445
- The worm scans for systems vulnerable to PnP exploit through this port
Port 69
- TFTP server port on infected systems
Port 8594
- The command shell port opened by the exploit code
Please see the following page for detailed information on the vulnerability:
