BleepingComputer.com: File Infector Takes Infection Up a Notch

Trend Micro threat analysts were alerted to the discovery of a not-so-common file infector. Unlike usual file infectors that only do simple modifications to the files they infect, PE_XPAJ.A does complex modifications to hide its malicious code...It uses a polymorphic-entry point obscuring (EPO)-cavity type of infection, which is capable of moving some of the host file’s codes to another location. The malware encrypts its signature in a different way every time it executes as well as the instructions for carrying...