alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Observed Malicious SSL Cert (ServHelper CnC)"; flow:established,to_client; tls.cert_subject; content:"CN=portofino.ug"; bsize:15; fast_pattern; reference:url,twitter.com/lazyactivist192/status/1214662422683885569; reference:md5,49a5cf0633b40d89b139ad3df85778c5; classtype:domain-c2; sid:2029245; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2020_01_09, deployment Perimeter, deprecation_reason Relevance, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_01, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)