alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MalDoc/TA427 Payload Request (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?na="; fast_pattern; content:".gif"; endswith; http.user_agent; content:"curl"; startswith; http.header_names; content:!"Referer"; reference:md5,6d6c239e3484915b6897bffb44c38e7b; classtype:trojan-activity; sid:2045637; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_05_11, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_11;)