Backdoor.Wiarp is a backdoor Trojan that opens a back door on the corrupted PC. Once Backdoor.Wiarp is launched, it creates several malicious files. Then, Backdoor.Wiarp opens a back door by connecting to the specific location [http://]update.yahoo-upgrade.com/ch[REMOVED] and waits for directions from remote hackers. Remote hackers can execute lots of harmful actions such as download a remote file, open a command line, drop files into running processes, stop running processes, create a service. Uninstall Backdoor.Wiarp before it destroys your machine.