### Comment:
Can you explain how malware can evade detection by antivirus software?

### REPLY:
One method to evade antivirus detection is by using rootkit techniques, where malware gains administrator-level access and modifies the operating system to hide its presence. Another approach is to encrypt the malware code, making it difficult for antivirus software to analyze and identify it. Advanced malware can also use fileless techniques, running directly in memory without leaving traces on the file system, making it harder to detect and eliminate.