ET WEB_SERVER Suspected FOXSHELL Variant Webshell Activity

Query · suricata

flow:established,to_client;
http.response_body;
content:"200"; fast_pattern; startswith;
pcre:"/^\n(?:[0-9A-F]{122})\n1.5\n$/R";
target:src_ip;
Raw source ET WEB_SERVER Suspected FOXSHELL Variant Webshell Activity · 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 -> $EXTERNAL_NET any (
    msg:"ET WEB_SERVER Suspected FOXSHELL Variant Webshell Activity";
    flow:established,to_client;
    http.response_body;
    content:"200"; fast_pattern; startswith;
    pcre:"/^\n(?:[0-9A-F]{122})\n1.5\n$/R";
    reference:md5,2e803d28809be2a0216f25126efde37b;
    reference:url,research.checkpoint.com/2023/from-albania-to-the-middle-east-the-scarred-manticore-is-listening/;
    classtype:trojan-activity;
    sid:2049012; rev:1;
    metadata:attack_target Server, created_at 2023_11_01, deployment Perimeter, confidence Medium, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_03, reviewed_at 2023_11_01, 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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