alert http $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:1;
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 2022_02_24;
)