ET MALWARE NORTHSTAR Client CnC Checkin

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/smanage.php?sid="; startswith; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
http.header_names;
content:!"Referer";
content:!"User-Agent";
Raw source ET MALWARE NORTHSTAR Client CnC Checkin · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE NORTHSTAR Client CnC Checkin";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/smanage.php?sid="; startswith; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R";
    http.header_names;
    content:!"Referer";
    content:!"User-Agent";
    reference:url,github.com/EnginDemirbilek/NorthStarC2/;
    classtype:command-and-control;
    sid:2030188; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2020_05_19, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_19;
)

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