alert tcp $HOME_NET [!$HTTP_PORTS,!445,!22] -> any any (msg:"ET RETIRED Malformed HeartBeat Response"; flow:established,from_server; flowbits:isset,ET.MalformedTLSHB; content:"|18 03|"; depth:2; byte_test:1,<,4,2; byte_test:2,>,200,3; threshold:type limit,track by_src,count 1,seconds 120; reference:cve,2014-0160; reference:url,blog.inliniac.net/2014/04/08/detecting-openssl-heartbleed-with-suricata/; reference:url,heartbleed.com/; reference:url,blog.fox-it.com/2014/04/08/openssl-heartbleed-bug-live-blog/; classtype:bad-unknown; sid:2018373; rev:6; metadata:created_at 2014_04_08, cve CVE_2014_0160, former_category EXPLOIT, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17;)