alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Maldoc Activity (GET)"; flow:established,to_server; urilen:<15; http.method; content:"GET"; http.uri; content:"/_vti_inf."; startswith; fast_pattern; pcre:"/^(?:html|php)$/R"; http.user_agent; content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|MS|20|FrontPage|20|"; startswith; reference:md5,66486dbb4a01b9c48761498db2e13579; reference:url,twitter.com/DmitriyMelikov/status/1742855526864564426; classtype:misc-activity; sid:2049914; rev:2; 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_18;)