ET MALWARE Golang/Sandcat Plugin Activity (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/beacon"; bsize:7;
http.user_agent;
content:"Go-http-client/"; startswith;
http.accept_enc;
content:"gzip"; bsize:4;
http.request_body;
content:"eyJ"; startswith; fast_pattern;
pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Golang/Sandcat Plugin Activity (POST) · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Golang/Sandcat Plugin Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/beacon"; bsize:7;
    http.user_agent;
    content:"Go-http-client/"; startswith;
    http.accept_enc;
    content:"gzip"; bsize:4;
    http.request_body;
    content:"eyJ"; startswith; fast_pattern;
    pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/";
    http.header_names;
    content:!"Referer";
    reference:url,github.com/mitre/sandcat;
    classtype:trojan-activity;
    sid:2043217; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2023_01_05, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_01_05;
)

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