alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Malicious SSL certificate detected (Powershell Trojan)"; flow:established,to_client; tls.cert_serial; content:"00:D6:E6:05:E6:06:E6:17:3F"; fast_pattern; reference:url,pastebin.com/7wYupkJL; reference:md5,4c5c9014f2d18f11ca62848876551323; classtype:domain-c2; sid:2023342; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2016_10_17, deployment Perimeter, malware_family PowerShell, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)