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

### REPLY:
Malware can employ various techniques to avoid detection by antivirus software. One common method is by using packers or crypters to encrypt the malicious code, making it difficult for antivirus software to identify the malware signature. Another technique is polymorphism, where the malware constantly changes its code structure to evade detection. Additionally, malware can use rootkit techniques to hide its presence on the infected system and manipulate the behavior of antivirus software.