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:".stc"; endswith; fast_pattern; http.host; content:".ru"; endswith; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:md5,20bb6aec6889f9135d29ad40f4a25c23; classtype:trojan-activity; sid:2035199; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_15, deployment Perimeter, deprecation_reason Age, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_25, reviewed_at 2023_08_25;)