### Comment:
How can malware evade detection by antivirus software?

### REPLY:
Malware can employ several techniques to evade detection by antivirus software. One method is through code obfuscation, which involves altering the code in a way that makes it difficult for antivirus programs to recognize the malware's signature. Another technique is polymorphism, where the malware constantly changes its code structure and behavior to avoid detection. Additionally, rootkit technology can be used to hide the presence of malware on a system by modifying the operating system's functions and API calls.