Malware Pack -

Packing originated in the 1990s for benign purposes: reducing file size (e.g., UPX, ASPack) and protecting intellectual property (e.g., Themida, Enigma Protector). Attackers quickly realized the security implications: packing a known malware sample changes its hash and structural signatures, causing signature-based AV to miss it.

A packer is a program that takes an input executable (EXE, DLL, shellcode) and produces an output executable that contains: malware pack