alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; pcre:"/^\/[0-9]{2}\.[0-9]{2}_[a-zA-Z]{2,3}\//"; content:".rtf"; fast_pattern; endswith; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,a92725505b8c44cd167ad1c3c8b122ab; reference:md5,5c1d61ecae84008164bf388712c6b93c; reference:url,unit42.paloaltonetworks.com/trident-ursa/; classtype:trojan-activity; sid:2042994; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_12_22, deployment Perimeter, deployment SSLDecrypt, malware_family Gamaredon, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_26; target:src_ip;)