alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Activity (GET)"; flow:established,to_server; urilen:>25; http.uri; content:".fbx"; endswith; fast_pattern; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:url,github.com/stamparm/maltrail; reference:url,twitter.com/Cyber0verload/status/1633122380171051009; classtype:trojan-activity; sid:2044523; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_03_07, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_07; target:src_ip;)