3.11. Archive Format DependencySome viruses might not be able to spread without packed files. A few viruses only infect archive file formats. The majority of such viruses infect binary files, as well as ZIP, ARJ, RAR, and CAB files (to name the most common archive formats).46, even use password-protected attachments. Because the password and instructions on how to use it are available to the user, the malicious code can trick the user into running an application, such as Winzip, and typing the given password to unpack and then execute its content. Such viruses often carry their own packer engines, such as InfoZIP libraries, to create new packer containers.47, infect self-extracting EXE files with multiple archive infection capability, including the packed file format, HA, inside such binary files. |