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

### REPLY:
One effective technique used by malware to evade detection by antivirus software is to exploit zero-day vulnerabilities, which are unknown vulnerabilities in software that have not been patched by the vendor. By exploiting these vulnerabilities, malware can bypass antivirus detection and infect systems without being detected. Additionally, some malware may use rootkit techniques to hide their presence and activities on the infected system, making it harder for antivirus software to detect and remove them.