ET MALWARE BirchParalysis Payload Request (GET) M2

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"/main/mh1-"; fast_pattern;
content:".png"; endswith;
http.user_agent;
content:"WindowsPowerShell";
http.host;
pcre:"/^(?:raw\x2e)?github(?:usercontent)?\x2ecom$/";
http.header_names;
content:!"|0d 0a|referer|0d 0a|"; nocase;
content:!"|0d 0a|content-type|0d 0a|"; nocase;
target:src_ip;
Raw source ET MALWARE BirchParalysis Payload Request (GET) M2 · 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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE BirchParalysis Payload Request (GET) M2";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"/main/mh1-"; fast_pattern;
    content:".png"; endswith;
    http.user_agent;
    content:"WindowsPowerShell";
    http.host;
    pcre:"/^(?:raw\x2e)?github(?:usercontent)?\x2ecom$/";
    http.header_names;
    content:!"|0d 0a|referer|0d 0a|"; nocase;
    content:!"|0d 0a|content-type|0d 0a|"; nocase;
    classtype:trojan-activity;
    sid:2066228; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_12_09, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, updated_at 2025_12_09;
    target:src_ip;
)

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