alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Cobalt Strike CnC Domain (yawero .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"yawero.com"; bsize:10; fast_pattern; reference:url,thedfirreport.com/2021/10/04/bazarloader-and-the-conti-leaks; classtype:domain-c2; sid:2034099; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_04, deployment Perimeter, confidence High, signature_severity Major, tag SSL_TLS_SNI, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)