ET MALWARE Gasket CnC Checkin

Query · suricata

flow:established,to_server;
pcre:"/^[\x20-\x7e\r\n]{0,13}[^\x20-\x7e\r\n]/Psi";
http.method;
content:"POST";
http.uri;
content:"/cert/trust"; bsize:11; fast_pattern;
http.user_agent;
content:"Go-http-client"; startswith;
http.host;
pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\:\d{1,5})?$/";
Raw source ET MALWARE Gasket 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Gasket CnC Checkin";
    flow:established,to_server;
    pcre:"/^[\x20-\x7e\r\n]{0,13}[^\x20-\x7e\r\n]/Psi";
    http.method;
    content:"POST";
    http.uri;
    content:"/cert/trust"; bsize:11; fast_pattern;
    http.user_agent;
    content:"Go-http-client"; startswith;
    http.host;
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}(?:\:\d{1,5})?$/";
    reference:url,unit42.paloaltonetworks.com/gasket-and-magicsocks-tools-install-mespinoza-ransomware/;
    classtype:command-and-control;
    sid:2033339; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_07_15, deployment Perimeter, malware_family Gasket, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_15;
)

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