alert tcp any any -> $HOME_NET any (msg:"ET EXPLOIT TLS HeartBeat Request (Client Initiated) fb set"; flow:established,to_server; flowbits:isnotset,ET.HB.Response.CI; flowbits:set,ET.HB.Request.CI; flowbits:noalert; content:"|18 03|"; depth:2; byte_test:1,<,4,2; 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:2018376; rev:6; metadata:created_at 2014_04_09, cve CVE_2014_0160, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)