alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed IcedID Domain (asleytomafa .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".asleytomafa.com"; endswith; fast_pattern; reference:url,github.com/PaloAltoNetworks/Unit42-timely-threat-intel/blob/main/2023-10-31-IOCs-for-IcedID-infection.txt; classtype:trojan-activity; sid:2049069; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_11_03, deployment Perimeter, malware_family IcedID, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_03, reviewed_at 2024_01_26, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)