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

### REPLY:
To evade detection by antivirus software, malware can use advanced techniques such as rootkit installation, which allows it to hide itself from the operating system and antivirus scans. Another method is to use fileless malware, which resides solely in memory and leaves no traces on the victim's system. Additionally, malware can also employ anti-analysis techniques such as sandbox detection, where it checks if it is running in a virtual environment used for analysis, and alters its behavior accordingly.