Adversaries may utilize polymorphic code (also known as metamorphic or mutating code) to evade detection. Polymorphic code is a type of software capable of changing its runtime footprint during code execution.^[1] With each execution of the software, the code is mutated into a different version of itself that achieves the same purpose or objective as the original. This functionality enables the malware to evade traditional signature-based defenses, such as antivirus and antimalware tools.^[2]
Other obfuscation techniques can be used in conjunction with polymorphic code to accomplish the intended effects, including using mutation engines to conduct actions such as Software Packing, Command Obfuscation, or Encrypted/Encoded File.^[3],[4]

References

1. Blackberry. (n.d.). What is Polymorphic Malware?. Retrieved September 27, 2024.
2. SentinelOne. (2023, March 18). What is Polymorphic Malware? Examples and Challenges. Retrieved September 27, 2024.
3. Sherwin Akshay. (2024, May 28). Techniques for concealing malware and hindering analysis: Packing up and unpacking stuff. Retrieved September 27, 2024.
4. Shellseekercyber. (2024, January 7). Explainer: Packed Malware. Retrieved September 27, 2024.

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