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

### REPLY:
One common technique used in malware propagation is through the use of zero-day exploits, which are vulnerabilities that are unknown to the software vendor. These exploits can be highly effective in infecting systems as they take advantage of unpatched vulnerabilities. Another technique involves using botnets to distribute malware, where a network of compromised computers is used to carry out coordinated attacks.