alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Pegasus Domain (hooklevel .com in TLS SNI)"; flow:established,to_server; tls.sni; content:"hooklevel.com"; bsize:13; fast_pattern; reference:url,citizenlab.ca/2021/08/bahrain-hacks-activists-with-nso-group-zero-click-iphone-exploits/; classtype:trojan-activity; sid:2033864; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_01, deployment Perimeter, malware_family Pegasus, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_01, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)