ET INFO Invalid GTP Response Packet Observed

Query · suricata

flow:stateless,to_client;
content:"|00|"; depth:1;
threshold:type limit,track by_dst,count 1,seconds 600;
target:src_ip;
Raw source ET INFO Invalid GTP Response Packet Observed · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert udp any 2123 -> any any (
    msg:"ET INFO Invalid GTP Response Packet Observed";
    flow:stateless,to_client;
    content:"|00|"; depth:1;
    threshold:type limit,track by_dst,count 1,seconds 600;
    reference:url,doubleagent.net/telecommunications/backdoor/gtp/2024/02/27/GTPDOOR-COVERT-TELCO-BACKDOOR;
    reference:url,github.com/sud0woodo/detect_gtpdoor;
    classtype:misc-activity;
    sid:2063369; rev:1;
    metadata:affected_product Linux, attack_target Server, tls_state plaintext, created_at 2025_07_09, deployment Perimeter, deployment Internal, deployment Datacenter, malware_family GTPDoor, confidence Medium, signature_severity Informational, updated_at 2025_07_09, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services;
    target:src_ip;
)

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