Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malware Delivery Related Domain (snap-guide-leeds-des .trycloudflare .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".snap-guide-leeds-des.trycloudflare.com"; endswith; fast_pattern; reference:url,twitter.com/karol_paciorek/status/1791056351843500196; classtype:trojan-activity; sid:2052738; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_05_17, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)