That would be extremly hard to create, i've never herd of such software... Your best bet is probably to try and hack into the forums..If, for example, you can get access to the file system via ftp you can get the sql username/password and then find the phpmyadmin system that your host uses. You can also try to login remotly to the mysql server to get a backup.
How are message attachments stored with ipb? If files are stored within the file system and you have access to change what type of files you can attach to a message via the forums acp you can set it to allow php files and upload (via attach) a php file that uses the readfile() or similar function to read the contents of the config file. From there you can use php to create a dump and then download the file. I've actually done that before
...