I jailbroke my friend's iphone with Blackrain yesterday and had no problems at all, but the next day she said 'there's a weird red head dude as my wallpaper that I can't get rid of'.
Lol
Sounds like the hack that was posted a while ago with the picture of that dude Rick Astley.
Ikee virus I think it was called.
Heres info on how to remove it and secure the iphone that runs OpenSSH by changing the root password. http://geniusgeeks.com/2009/11/remove-ikee-iphone-worm-easily-how-to/
And folks to protect yourself from this and any type of future exploits while using a JB iphone and having OpenSSH installed follow this step by step below. http://www.iclarified.com/entry/index.php?enid=5883