alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Gamaredon APT Related Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /chd.php HTTP/1.1"; fast_pattern; http.header_names; content:!"Referer"; http.user_agent; content:!"Linux"; content:!"Android"; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; reference:md5,0981f1145c1cec6a5de51c7d585affe3; reference:md5,bcbcc87f61fad5d558b25c1200b2c34d; reference:md5,ab8a866434329d643273b3dab0473bbc; classtype:trojan-activity; sid:2035283; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_02_24, deployment Perimeter, malware_family Gamaredon, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_04;)