alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Operation Pawn Storm IOS_XAGENT Checkin"; flow:to_server,established; http.uri; pcre:"/^(?:(?:sear|wat)ch|results|close|find|open)\/\?[a-zA-Z]{2,8}=/"; http.header_names; content:!"Referer|0d 0a|"; http.user_agent; content:"XAgent/1."; depth:9; fast_pattern; reference:url,blog.trendmicro.com/trendlabs-security-intelligence/pawn-storm-update-ios-espionage-app-found/; classtype:trojan-activity; sid:2020363; rev:4; metadata:attack_target Mobile_Client, created_at 2015_02_05, signature_severity Major, updated_at 2020_05_15, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)