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

### REPLY:
There are several techniques used in malware to evade detection by antivirus software. One common method is to use polymorphic code, which constantly changes its structure and signature to avoid detection. Another technique is using rootkits, which can hide malicious files and processes from antivirus scans. Additionally, malware can employ encryption or obfuscation techniques to make it difficult for antivirus programs to identify and analyze the malicious code.