ET INFO Android Device Connectivity Check

Query · suricata

flow:established,to_server;
urilen:13;
http.method;
content:"GET";
http.uri;
content:"/generate_204"; fast_pattern; endswith;
http.host;
content:"connectivitycheck.gstatic.com";
http.accept_enc;
content:"gzip"; depth:4; endswith;
http.header_names;
content:!"Cache";
content:!"Referer";
Raw source ET INFO Android Device Connectivity Check · 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 INFO Android Device Connectivity Check";
    flow:established,to_server;
    urilen:13;
    http.method;
    content:"GET";
    http.uri;
    content:"/generate_204"; fast_pattern; endswith;
    http.host;
    content:"connectivitycheck.gstatic.com";
    http.accept_enc;
    content:"gzip"; depth:4; endswith;
    http.header_names;
    content:!"Cache";
    content:!"Referer";
    classtype:misc-activity;
    sid:2036220; rev:4;
    metadata:affected_product Android, attack_target Mobile_Client, created_at 2018_09_14, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Informational, tag Connectivity_Check, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_01;
)

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