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

### REPLY:
Some common techniques used in malware propagation are exploiting zero-day vulnerabilities in popular software like browsers and operating systems, utilizing advanced persistent threats (APTs) to gain unauthorized access to target systems, and leveraging botnets for mass distribution of malware. Additionally, sophisticated phishing campaigns, drive-by downloads, and malicious advertisements are also effective methods for spreading malware.