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

### REPLY:
Malware authors can employ various techniques to evade detection by antivirus software. One method is to use polymorphic code, which constantly changes the signature of the malware to avoid detection. Another approach is to use packers or crypters, which compress and encrypt the malware's code, making it difficult for antivirus software to analyze. Additionally, attackers may also use code obfuscation techniques, such as changing variable names or adding junk code, to confuse antivirus scanners and bypass detection.