Troj/Xupiter-A is a downloader/updater for adware software.
Troj/Xupiter-A may be installed on a computer without the user's knowledge when certain websites are visited with ActiveX enabled.
W32/Agobot-NZ is a backdoor Trojan and worm which spreads to computers protected by weak passwords.
Each time the Trojan is run it attempts to connect to a remote IRC server and join a specific channel.
The Trojan then runs continuously in the background, allowing a remote intruder to access and control the computer via IRC channels.
The Trojan attempts to terminate and disable various anti-virus and security-related programs and modifies the HOSTS file.