Signature-Based Reliance

Traditional AVs rely heavily on signature-based detection:

1. Files are scanned for byte patterns that match known malware.

2. Signatures are stored in local databases and periodically updated.

Limitations:

1. Any modification (polymorphism, encryption, packers) invalidates the signature.

2. New malware strains or zero-days are not detected until signatures are updated.

3. AVs cannot detect fileless malware or in-memory execution techniques.

Evasion Tip: Use custom packers, polymorphic encoders, or generate payloads dynamically at runtime to avoid signature matching.