### Comment:
What are some common techniques used by malware to propagate and infect systems?

### REPLY:
Malware often spreads through various social engineering techniques, such as tricking users to download and execute malicious files disguised as legitimate software updates or cracked applications. Another method is through the use of exploit kits, which take advantage of vulnerabilities in software to install malware without the user's knowledge or consent. Additionally, malware can be distributed through malicious ads, infected USB drives, or even through compromised networks or servers.