alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Trojan.Nymeria CnC Activity (GET) M3"; flow:established,to_server; http.method; content:"GET"; http.header_names; content:!"Referer"; http.header; content:"Cache-Control|3a 20|no-cache|0d 0a|"; http.user_agent; content:"AutoIt"; bsize:6; http.uri; content:".php?cmd=Email"; fast_pattern; reference:md5,3fe6b67ca8cc95875dd1fe9f1ec7dc90; classtype:trojan-activity; sid:2034444; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_12, deployment Perimeter, deprecation_reason Age, malware_family Win32_Trojan_Nymeria, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_02, reviewed_at 2024_12_02;)