### Comment:
What is a common technique used by malware to evade detection by antivirus software?

### REPLY:
A common technique used by malware to evade detection is called rootkit. A rootkit is a type of malicious software that is designed to hide its presence and activities on an infected system. It can gain privileged access to the operating system, allowing it to modify system files, processes, and network connections. By hiding its presence, a rootkit can effectively evade detection by antivirus software and other security tools.