Malware
Cold$eal
aka ColdSeal
Cold$eal is a packer for encrypting (sealing) malware.
Cold$eal, also known as ColdSeal, is a Windows malware family.
Background
Cold$eal is a packer used to encrypt ("seal") malware, bundling AV-evasion tricks alongside some sandbox-detection capabilities. It was authored by $@dok (also known as Sadok or Coldseal). Originally offered as a cryptor service at coldseal.us, it was later marketed as a toolkit pairing the cryptor with a bespoke cryptostub and a FuD guarantee backed by free cryptostub updates. The payload was RC4-encrypted and embedded as a resource within the cryptostub, with the encryption key also stored inside that resource. At runtime the cryptostub would pull out the key, decrypt the payload, and self-inject the decrypted code. Note: the packed sample provided carries a harmless payload, whereas the unpacked sample is just the bare cryptostub with no payload.
Source: Malpedia (Fraunhofer FKIE).