alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Pegasus/Trident Related HTTP Beacon 4"; flow:established,to_server; http.uri; content:".html?s="; fast_pattern; content:"&d="; distance:0; pcre:"/^[^&]+?\.html\?s=[^&]+?&d=$/"; reference:url,citizenlab.org/2016/08/million-dollar-dissident-iphone-zero-day-nso-group-uae/; classtype:trojan-activity; sid:2023134; rev:4; metadata:affected_product iOS, attack_target Client_Endpoint, created_at 2016_08_26, deployment Perimeter, malware_family Pegasus_Trident, malware_family NSO, confidence Medium, signature_severity Major, tag c2, updated_at 2020_07_27, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)