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

### REPLY:
One common technique to evade detection by antivirus software is by using packers or crypters. These tools can encrypt or compress the malware, making it difficult for antivirus software to detect the malicious code. Another method is by using polymorphic or metamorphic techniques, where the malware constantly changes its code or behavior to avoid signature-based detection. Additionally, malware authors can use rootkit technologies to hide the presence of the malware on the system, making it harder for antivirus software to detect and remove it.