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

### REPLY:
One effective method to evade detection by antivirus software is to exploit zero-day vulnerabilities in the targeted system, as antivirus software may not have signatures or heuristics to detect such new threats. Additionally, malware creators can use packers or encrypt the malware code to make it harder for antivirus software to identify the malicious behavior. Another approach is to use virtual machine detection techniques to check if the malware is running in a virtual environment, as many security researchers use virtual machines for analysis purposes.