alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrojanDownloader.Agent.GEM CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.request_body; content:"uid="; startswith; content:"&avtype="; distance:0; content:"&majorv="; fast_pattern; content:"&minorv="; reference:url,twitter.com/jaydinbas/status/1506987283630768138; reference:md5,ecd47e596048ad1af9973a21af303465; classtype:command-and-control; sid:2035592; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_03_24, deployment Perimeter, malware_family Win32_TrojanDownloader_Agent_GEM, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_24;)