alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/TrojanDownloader.Agent.GEM CnC Domain Fetch"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/zs_url.txt?dl=0"; endswith; fast_pattern; http.host; content:"dl.dropboxusercontent.com"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; http.connection; content:"Keep-Alive"; reference:url,twitter.com/jaydinbas/status/1506987283630768138; reference:md5,ecd47e596048ad1af9973a21af303465; classtype:trojan-activity; sid:2035606; rev:4; 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 2024_04_26;)