Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed GammaDrop CnC Domain (infected-gc-rhythm-yu .trycloudflare .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".infected-gc-rhythm-yu.trycloudflare.com"; endswith; fast_pattern; reference:url,go.recordedfuture.com/hubfs/reports/cta-ru-2024-1205.pdf; classtype:command-and-control; sid:2058985; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_01_06, deployment Perimeter, malware_family GammaDrop, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_01_06;)