### Comment:
What are some common methods used to hide malware from antivirus software?

### REPLY:
There are several techniques to hide malware from antivirus software. One method is by using packers or crypters to obfuscate the code, making it difficult for antivirus programs to detect. Another approach is polymorphic malware, which constantly changes its code to avoid detection. Rootkit techniques can also be used to hide the presence of malware by manipulating the operating system. Additionally, attackers may use fileless malware, which resides only in memory, making it challenging to detect.