alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".ndf"; endswith; fast_pattern; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,eecaecd170ef3d7a5976d435f6d03ef8; reference:url,twitter.com/500mk500/status/1502545185510731777; classtype:trojan-activity; sid:2035449; rev:4; metadata:attack_target Client_Endpoint, created_at 2022_03_14, deployment Perimeter, deprecation_reason Age, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_04, reviewed_at 2023_08_25;)