alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible UNC1878/FIN12 Cobalt Strike CnC SSL Cert Inbound (lol)"; flow:established,to_client; tls.cert_subject; content:", O=lol, "; fast_pattern; tls.cert_issuer; content:", O=lol, "; reference:md5,45ed8898bead32070cf1eb25640b414c; reference:url,www.youtube.com/watch?v=BhjQ6zsCVSc; classtype:targeted-activity; sid:2031133; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_10_21, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence Medium, signature_severity Major, tag SSL_Suspicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21;)