alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /wsusa HTTP/1.1"; fast_pattern; http.header_names; content:!"Referer"; http.user_agent; content:"|3b 20|ms-office|3b 20|"; reference:url,www.anomali.com/blog/primitive-bear-gamaredon-targets-ukraine-with-timely-themes; reference:md5,f8af71e85f5bee6b3fee2fcfd15da893; classtype:trojan-activity; sid:2035222; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_18, 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;)