The worm also infects systems with the Agobot worm, which can open a backdoor on infected systems and allow remote code execution.
Upon execution, Bropia.F puts a copy of itself in the Windows system folder, and then tries to propagate to other MSN Messenger users by sending a copy of itself using various filenames like Naked_drunk.pif, Webcam.pif, and ROFL.pif.More info at NewsFactor
The worm also launches the Agobot worm, which puts a backdoor into the infected system, which may allow commands to be executed by a remote, malicious user.