ET ATTACK_RESPONSE Possible hosts File Output via HTTP (Windows Style)

Query · suricata

flow:established,to_client;
http.response_body;
content:!"<html";
content:"127.0.0.1";
content:"localhost|0d 0a|"; fast_pattern; within:11;
pcre:"/^127\.0\.0\.1\s+localhost[\r\n]+/m";
target:src_ip;
Raw source ET ATTACK_RESPONSE Possible hosts File Output via HTTP (Windows 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 hosts File Output via HTTP (Windows Style)";
    flow:established,to_client;
    http.response_body;
    content:!"<html";
    content:"127.0.0.1";
    content:"localhost|0d 0a|"; fast_pattern; within:11;
    pcre:"/^127\.0\.0\.1\s+localhost[\r\n]+/m";
    classtype:successful-recon-limited;
    sid:2049403; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Server, created_at 2023_11_30, deployment Perimeter, performance_impact Low, confidence Low, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_30, 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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