ET WEB_SERVER Suspected HrServ Webshell Related Activity M1

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/FC4B97EB-2965-4A3B-8BAD-B8172DE25520/"; startswith; fast_pattern;
content:"&cp="; distance:0;
pcre:"/^[0247]/R";
content:"&client="; within:8;
content:"&xssi="; distance:0;
content:"&hl="; distance:0;
content:"&authuser="; distance:0;
content:"&pq="; distance:0;
target:dest_ip;
Raw source ET WEB_SERVER Suspected HrServ Webshell Related Activity M1 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SERVER Suspected HrServ Webshell Related Activity M1";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/FC4B97EB-2965-4A3B-8BAD-B8172DE25520/"; startswith; fast_pattern;
    content:"&cp="; distance:0;
    pcre:"/^[0247]/R";
    content:"&client="; within:8;
    content:"&xssi="; distance:0;
    content:"&hl="; distance:0;
    content:"&authuser="; distance:0;
    content:"&pq="; distance:0;
    reference:url,securelist.com/hrserv-apt-web-shell/111119/;
    reference:md5,d0fe27865ab271963e27973e81b77bae;
    classtype:trojan-activity;
    sid:2050028; rev:1;
    metadata:affected_product Microsoft_IIS, attack_target Web_Server, created_at 2024_01_12, deployment Perimeter, confidence Medium, signature_severity Major, tag WebShell, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_12, mitre_tactic_id TA0003, mitre_tactic_name Persistence, mitre_technique_id T1505, mitre_technique_name Server_Software_Component;
    target:dest_ip;
)

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