alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrojanDownloader.Agent.FLZ CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".aspx?ShopId="; pcre:"/^\/(?:GetProDownConfig|downservers|ShopIp)\.aspx\?ShopId=[0-9]+$/"; http.header_names; content:"|0d 0a|HOST|0d 0a|Connection|0d 0a 0d 0a|"; bsize:22; fast_pattern; reference:md5,8767e31c8052f43b6a74557d9579653e; classtype:command-and-control; sid:2037032; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_06_17, deployment Perimeter, malware_family Win32_TrojanDownloader_Agent_FLZ, confidence High, signature_severity Major, tag c2, updated_at 2022_06_17, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)