ET MALWARE RATatouille rand-user-agent Supply Chain Compromise CnC Activity (POST)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE RATatouille rand-user-agent Supply Chain Compromise CnC Activity (POST)";
    flow:established,to_server;
    flowbits:set,ET.RATatouille.Connect;
    urilen:4;
    http.method;
    content:"POST";
    http.uri;
    content:"/u/f"; fast_pattern;
    http.user_agent;
    content:"python-requests"; nocase;
    http.request_body;
    content:"form|2d|data|3b 20|name|3d 22|client|5f|id|22|";
    content:"|24|"; distance:0;
    content:"Content|2d|Disposition|3a 20|form|2d|data|3b 20|name|3d 22|path|22|"; distance:0;
    reference:md5,c1b54de2dde3c72eab2b7b2e9ae76ea4;
    reference:url,aikido.dev/blog/catching-a-rat-remote-access-trojian-rand-user-agent-supply-chain-compromise;
    classtype:command-and-control;
    sid:2062283; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Linux, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_05_12, deployment Perimeter, signature_severity Critical, updated_at 2025_05_12, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;
    target:src_ip;
)