ET ATTACK_RESPONSE Possible /etc/shadow via HTTP M2

Query · suricata

flow:established,to_client;
http.response_body;
content:"root|3a 21 3a|"; fast_pattern;
content:"|3a|0|3a|"; within:9;
content:"|3a 3a 3a 0a|"; within:17;
Raw source ET ATTACK_RESPONSE Possible /etc/shadow via HTTP M2 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http [$HTTP_SERVERS,$HOME_NET] any -> $EXTERNAL_NET any (
    msg:"ET ATTACK_RESPONSE Possible /etc/shadow via HTTP M2";
    flow:established,to_client;
    http.response_body;
    content:"root|3a 21 3a|"; fast_pattern;
    content:"|3a|0|3a|"; within:9;
    content:"|3a 3a 3a 0a|"; within:17;
    reference:url,linuxize.com/post/etc-shadow-file/;
    classtype:successful-recon-limited;
    sid:2049388; rev:1;
    metadata:attack_target Server, created_at 2023_11_29, deployment Perimeter, performance_impact Low, confidence Low, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_29, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component;
)

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