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

### REPLY:
One effective method to evade detection by antivirus software is to use rootkit techniques. A rootkit is a collection of tools and techniques used to hide malicious software from detection. It can modify the operating system to hide its presence and allow the malware to persistently run on the infected system. Additionally, malware can also use anti-emulation and anti-sandbox techniques to detect if it is being analyzed in a virtual environment and avoid detection.