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

### REPLY:
There are several techniques that can be used to evade antivirus detection. One method is to use polymorphic code, which is code that can change its structure each time it is executed, making it difficult for antivirus programs to identify. Another technique is to use packers or crypters to encrypt the malware, making it harder for antivirus programs to detect the malicious code. Additionally, attackers can use rootkit techniques to hide the presence of malware on a system, making it even more challenging for antivirus software to detect and remove it.