ET MALWARE Possible Win32/Qbot/Quakbot Checkin via HTTP GET

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:".png?uid="; fast_pattern;
pcre:"/\/\d+\.png\?uid=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})+$/";
http.user_agent;
content:!"Mozilla";
http.header_names;
content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:59; endswith;
Raw source ET MALWARE Possible Win32/Qbot/Quakbot Checkin via HTTP GET · Suricata
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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 -> $EXTERNAL_NET any (
    msg:"ET MALWARE Possible Win32/Qbot/Quakbot Checkin via HTTP GET";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:".png?uid="; fast_pattern;
    pcre:"/\/\d+\.png\?uid=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})+$/";
    http.user_agent;
    content:!"Mozilla";
    http.header_names;
    content:"|0d 0a|Connection|0d 0a|Accept|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; depth:59; endswith;
    classtype:command-and-control;
    sid:2030157; rev:2;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_05_12, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_12;
)

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