alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon Related Maldoc Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/principles/"; fast_pattern; content:".mp3"; endswith; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,4c61eeb1745d24e2c4ee67c6e56af8f3; reference:url,twitter.com/500mk500/status/1486791607311548423; classtype:trojan-activity; sid:2035006; rev:3; metadata:attack_target Client_Endpoint, created_at 2022_01_28, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)