ET EXPLOIT GTPDoor Trigger Packet Response

Query · suricata

flow:stateless,to_client;
content:"|02|"; offset:1; depth:1;
content:"|72 1f 18 08|"; distance:15; within:4; fast_pattern;
xbits:isset,ET.gptdoor.udp,track ip_pair,expire 10;
threshold:type limit,track by_dst,count 1,seconds 600;
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET EXPLOIT GTPDoor Trigger Packet Response · Suricata
Esc
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 EXPLOIT GTPDoor Trigger Packet Response";
    flow:stateless,to_client;
    content:"|02|"; offset:1; depth:1;
    content:"|72 1f 18 08|"; distance:15; within:4; fast_pattern;
    xbits:isset,ET.gptdoor.udp,track ip_pair,expire 10;
    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:trojan-activity;
    sid:2063368; 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 Major, 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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