### Comment:
What are some techniques used to hide malware in legitimate files?

### REPLY:
One technique to hide malware in legitimate files is to use fileless malware, which resides in the computer's memory and leaves no trace on the hard drive. Another approach is to use steganography, where the malware is embedded within images, audio files, or even documents, making it difficult to detect. Additionally, polymorphic malware can change its code and appearance each time it infects a new file, making it harder to detect and remove.