ET MALWARE Win32/Bisonal Backdoor CnC Activity (POST)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"/post.asp"; endswith;
http.host;
content:".com#.com"; fast_pattern; endswith;
http.header_names;
content:!"Referer";
Raw source ET MALWARE Win32/Bisonal Backdoor CnC 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 Win32/Bisonal Backdoor CnC Activity (POST)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/post.asp"; endswith;
    http.host;
    content:".com#.com"; fast_pattern; endswith;
    http.header_names;
    content:!"Referer";
    reference:md5,60490ea995531924f77af5f1bfb38eec;
    reference:url,twitter.com/nao_sec/status/1438460553479921665;
    classtype:trojan-activity;
    sid:2033964; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2021_09_16, deployment Perimeter, deployment SSLDecrypt, malware_family Bisonal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_16, reviewed_at 2023_08_22;
)

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