Versions (4)
Version DetailsCurrent
Rev: 1 • Sep 2, 2021, 12:00 PMET INFO Observed Blockchain Domain (api .blockcypher .com in TLS SNI)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Blockchain Domain (api .blockcypher .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"api.blockcypher.com"; bsize:19; fast_pattern; classtype:bad-unknown; sid:2033877; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_02, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_02;)
Sep 2, 2021, 12:00 PM
Sep 2, 2021, 12:00 PM
Sep 21, 2024, 3:00 AM
Sep 9, 2025, 9:34 PM
rules/emerging-info.rules