ET WEB_SPECIFIC_APPS Ivanti EPM Cloud Services Appliance Backdoor Response (CVE-2021-44529)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.CVE-2021-44529.Request;
http.stat_code;
content:"200";
http.response_body;
content:"|3c|c123|3e|"; startswith; fast_pattern;
content:"|3c 2f|c123|3e|"; distance:0;
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 WEB_SPECIFIC_APPS Ivanti EPM Cloud Services Appliance Backdoor Response (CVE-2021-44529) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> any any (
    msg:"ET WEB_SPECIFIC_APPS Ivanti EPM Cloud Services Appliance Backdoor Response (CVE-2021-44529)";
    flow:established,to_client;
    flowbits:isset,ET.CVE-2021-44529.Request;
    http.stat_code;
    content:"200";
    http.response_body;
    content:"|3c|c123|3e|"; startswith; fast_pattern;
    content:"|3c 2f|c123|3e|"; distance:0;
    reference:url,attackerkb.com/topics/XTKrwlZd7p/cve-2021-44529;
    reference:cve,2021-44529;
    classtype:attempted-admin;
    sid:2059892; rev:1;
    metadata:affected_product Ivanti, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2025_02_05, cve CVE_2021_44529, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2025_02_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:src_ip;
)

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