### Comment:
What are some common techniques used by malware to evade detection by antivirus software?

### REPLY:
Malware can employ various techniques to evade detection by antivirus software. This includes using packers or encryptors to obfuscate the code and make it difficult for the antivirus software to detect the malicious behavior. Another technique is to use rootkit functionality to hide the presence of the malware in the system. Additionally, polymorphic or metamorphic malware can change their code structure or behavior to avoid signature-based detection. These techniques can allow the malware to remain undetected and continue its malicious activities on the infected system.