Actifed is a G2-generated encrypted computer virus which infects .COM and .EXE files but notcommand.com. The virus is loaded into memory by executing an infected program and then affects the computer's run-time operation and corrupts program files.
It is interesting that G2 is a computer virus creation tool written by Dark Angel of the Phalcon/Skism organisation. This organization also wrote the "Phalcon-Skism Mass Produced Code Generator" [PS-MPC] which was used in the creation of Abraxas and numerous other viruses.
G2 generates compact, easily modified, fully commented, source code of .COM and .EXE infectors. It also supports the creation of resident and non-resident encrypted and non-encrypted viruses. The PS-MPC has similar use.