While Trojan.Poweliks is unique in how it resides on a computer, it can arrive on a computer through more common methods, such as malicious spam emails and exploit kits."

A file-less Trojan calledis becoming increasingly prevalent now. This file-less Trojan virus hides inside a registry key.is said to be delivered through spam mails purporting to be from the Canadian or US postal services, and damages computers through opening a backdoor to future infection.Unlike other file-less virusesis able to survive system reboots by the use of an automatically booting register key which evades detection from a antivirus software.Symantec said :Still now Symantec ratesas a low level threat,and notes that it is easy to remove.