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Training Camp • Cybersecurity Glossary
A packer compresses or encrypts an executable so its code unpacks in memory at runtime, commonly abused by malware to evade signature detection.
Packer Definition: A packer compresses or encrypts an executable so its code unpacks in memory at runtime, commonly abused by malware to evade signature detection.
A packer is a tool that compresses, encrypts, or otherwise transforms an executable so that its true code is unpacked into memory only at runtime, originally used to reduce file size but widely abused by malware authors to evade static, signature-based detection. Variants that focus on encryption to defeat analysis are often called crypters. Defenders counter packers through dynamic analysis, memory forensics, and unpacking, since the obfuscation is stripped away once the program executes.
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