Which of the following techniques is commonly used in advanced malware?

The technique of polymorphism and metamorphism is commonly used in advanced malware as it enhances the malware's ability to evade detection by security solutions. This method involves altering the code of the malware each time it is executed or spread, which helps in disguising it and making it harder for traditional antivirus programs to recognize and flag it. Polymorphic malware changes its code while retaining the original algorithm, while metamorphic malware rewrites its own code completely, making it significantly challenging for signature-based detection systems to catch them.

This technique is particularly effective against static signatures, which rely on looking for specific byte patterns or strings in files to detect malware. Since polymorphic and metamorphic malware continuously change their appearance, they can slip past defenses that depend on identifying known signatures, allowing them to infiltrate systems and execute their malicious payloads more successfully.