ET MALWARE Suspected Tunna Proxy M4

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"?proxy&close"; endswith; fast_pattern;
http.accept_enc;
content:"gzip"; startswith; endswith;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Suspected Tunna Proxy M4 · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> $HOME_NET any (
    msg:"ET MALWARE Suspected Tunna Proxy M4";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"?proxy&close"; endswith; fast_pattern;
    http.accept_enc;
    content:"gzip"; startswith; endswith;
    http.header_names;
    content:!"Referer";
    reference:url,github.com/SECFORCE/Tunna;
    classtype:trojan-activity;
    sid:2028575; rev:2;
    metadata:created_at 2019_09_12, deployment Perimeter, malware_family Tunna, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_02;
)

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