Emerging Threats ETOpen – Anti-malware IDS/IPS Ruleset

The ETOpen Ruleset is an anti-malware IDS/IPS ruleset that enables users with cost constraints to significantly enhance their existing network-based malware detection. To use this ruleset you need an IDS such as Snort or Suricata.

https://www.proofpoint.com/us/threat-intelligence-open-source-community

http://rules.emergingthreats.net/