alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Trojan.Nymeria CnC"; flow:established,to_server; http.method; content:"GET"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; http.header; header_lowercase; content:"cache-control|3a 20|no-cache|0d 0a|"; http.user_agent; bsize:6; content:"AutoIt"; http.uri; content:".php?cmd=|29 2a 28|"; fast_pattern; reference:md5,3fe6b67ca8cc95875dd1fe9f1ec7dc90; classtype:trojan-activity; sid:2034437; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_11, deployment Perimeter, malware_family Win32_Trojan_Nymeria, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30;)