ET ATTACK_RESPONSE Possible arp command output via HTTP (Linux Style)

Query · suricata

flow:established,to_client;
http.response_body;
content:!"<html";
content:"|29 20|at|20|";
content:"|20 5b|ether|5d 20|on|20|"; fast_pattern; distance:17; within:12;
target:src_ip;
Raw source ET ATTACK_RESPONSE Possible arp command output via HTTP (Linux Style) · 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 http [$HOME_NET,$HTTP_SERVERS] any -> $EXTERNAL_NET any (
    msg:"ET ATTACK_RESPONSE Possible arp command output via HTTP (Linux Style)";
    flow:established,to_client;
    http.response_body;
    content:!"<html";
    content:"|29 20|at|20|";
    content:"|20 5b|ether|5d 20|on|20|"; fast_pattern; distance:17; within:12;
    classtype:successful-recon-limited;
    sid:2049391; 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;
    target:src_ip;
)

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