alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed TA453 Domain in TLS SNI"; flow:established,to_server; tls.sni; bsize:34; content:"accurate-sprout-porpoise.glitch.me"; fast_pattern; reference:url,cloud.google.com/blog/topics/threat-intelligence/untangling-iran-apt42-operations; classtype:trojan-activity; sid:2052441; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_03_05, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06, former_sid 2856454, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)