alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrojanDownloader.Agent.GEM CnC Command Fetch"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/fecommand.acm"; endswith; fast_pattern; http.header_names; content:!"Referer"; http.connection; content:"Keep-Alive"; reference:url,twitter.com/jaydinbas/status/1506987283630768138; reference:md5,ecd47e596048ad1af9973a21af303465; classtype:trojan-activity; sid:2035605; rev:3; 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, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)