ET MALWARE Win32/Qbot CnC Activity M3 (POST)

Query · suricata

flow:established,to_server;
http.request_line;
content:"POST|20|/t5|20|HTTP/1.1"; bsize:17; fast_pattern;
http.accept;
content:"application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, */*"; bsize:70;
http.request_body;
pcre:"/^[A-Za-z0-9]{3,20}=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/si";
http.header_names;
content:!"Referer";
Raw source ET MALWARE Win32/Qbot CnC Activity M3 (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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Win32/Qbot CnC Activity M3 (POST)";
    flow:established,to_server;
    http.request_line;
    content:"POST|20|/t5|20|HTTP/1.1"; bsize:17; fast_pattern;
    http.accept;
    content:"application/x-shockwave-flash, image/gif, image/jpeg, image/pjpeg, */*"; bsize:70;
    http.request_body;
    pcre:"/^[A-Za-z0-9]{3,20}=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/si";
    http.header_names;
    content:!"Referer";
    reference:md5,da51dd657868bf4d2924b4398e045b27;
    classtype:command-and-control;
    sid:2038776; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_09_08, deployment Perimeter, deployment SSLDecrypt, malware_family Qbot, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_08;
)

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