alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"|2f 5f|vti|5f|bin|2f|"; startswith; content:".exe/_vti_rpc"; endswith; fast_pattern; http.user_agent; content:"MSFrontPage/"; startswith; http.header_names; content:"X-Vermeer-Content-Type"; content:!"Referer"; reference:md5,66486dbb4a01b9c48761498db2e13579; reference:url,twitter.com/DmitriyMelikov/status/1742855526864564426; classtype:misc-activity; sid:2049913; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_01_04, deployment Perimeter, confidence Medium, signature_severity Critical, tag Gamaredon, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_04;)