### Comment:
What are some common techniques used in malware propagation?

### REPLY:
One common technique used in malware propagation is the use of spear-phishing emails, where the attacker impersonates a trusted entity and tricks the recipient into clicking on a malicious link or downloading an infected attachment. Another technique is the exploitation of software vulnerabilities, where the attacker takes advantage of security flaws in popular software applications to install malware without the user's knowledge.