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

### REPLY:
One common technique used by malware to evade antivirus detection is to exploit zero-day vulnerabilities in popular software. By using these vulnerabilities, the malware can bypass antivirus software and gain access to the target system. Another technique is to use rootkit techniques to hide the presence of the malware, making it difficult for antivirus software to detect and remove it. Additionally, malware developers may use packers or encrypt the code to obfuscate the malware's signature, making it harder for antivirus software to identify and block it.