Troj/StartPa-FG is a Windows Trojan DLL component which attempts to modify the Microsoft Internet Explorer shell extensions when loaded.
W32/Rbot-YO is a Windows network worm which attempts to spread via network shares. The worm contains backdoor functions that allows unauthorised remote access to the infected computer via IRC channels while running in the background.
The worm spreads to network shares with weak passwords and also by using the LSASS security exploit (MS04-011) and the RPC-DCOM security exploit (MS03-039).
Once installed, W32/Rbot-YO will attempt to participate in denial of service (DoS) attacks, download and run files from the internet, steal CD keys, log keystrokes and login to MS SQL servers and send EXEC commands to open a command shell when instructed to do so by a remote attacker.