alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE OSX/Proton.C/D Domain (handbrake .cc) in TLS SNI"; flow:established,to_server; tls.sni; content:"handbrake.cc"; bsize:12; fast_pattern; nocase; reference:url,www.welivesecurity.com/2017/10/20/osx-proton-supply-chain-attack-elmedia; classtype:trojan-activity; sid:2024893; rev:6; metadata:affected_product Mac_OSX, attack_target Client_Endpoint, created_at 2017_10_20, deployment Perimeter, malware_family Proton, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2022_07_22;)