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:"/serious/"; startswith; fast_pattern; content:".dot"; endswith; http.user_agent; content:"|3b 20|ms-office|3b 20|"; http.header_names; content:!"Referer"; reference:md5,d18a972797c6636cb3a0225242e57d58; classtype:trojan-activity; sid:2038810; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_13;)