alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed CobaltStrike CnC Domain (stg .pesrado .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"stg.pesrado.com"; bsize:15; fast_pattern; reference:url,twitter.com/mojoesec/status/1418625292105654275; reference:md5,69519748fdb0bedaab25c702bfd0ed9a; classtype:domain-c2; sid:2033458; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_07_27, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_27, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)