ET INFO Possible JARM Fingerprinting Client Hello via tls1_2_bottom_half

Query · suricata

flow:established,to_client;
tls.version:1.2;
content:"|c0 13 c0 27 c0 2f c0 14 c0 28 c0 30 c0 60 c0 61 c0 76 c0 77 cc a8 13 05 13 04 13 03 cc 13 c0 11 00 0a 00 2f 00 3c c0 9c c0 a0 00 9c 00 35 00 3d c0 9d c0 a1 00 9d 00 41 00 ba 00 84 00 c0 00 07 00 04 00 05|"; fast_pattern;
content:"|08|http/0.9|08|http/1.0|06|spdy/1|06|spdy/2|06|spdy/3|03|h2c|02|hq";
Raw source ET INFO Possible JARM Fingerprinting Client Hello via tls1_2_bottom_half · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tls $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET INFO Possible JARM Fingerprinting Client Hello via tls1_2_bottom_half";
    flow:established,to_client;
    tls.version:1.2;
    content:"|c0 13 c0 27 c0 2f c0 14 c0 28 c0 30 c0 60 c0 61 c0 76 c0 77 cc a8 13 05 13 04 13 03 cc 13 c0 11 00 0a 00 2f 00 3c c0 9c c0 a0 00 9c 00 35 00 3d c0 9d c0 a1 00 9d 00 41 00 ba 00 84 00 c0 00 07 00 04 00 05|"; fast_pattern;
    content:"|08|http/0.9|08|http/1.0|06|spdy/1|06|spdy/2|06|spdy/3|03|h2c|02|hq";
    reference:url,engineering.salesforce.com/easily-identify-malicious-servers-on-the-internet-with-jarm-e095edac525a;
    classtype:misc-activity;
    sid:2036693; rev:1;
    metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_05_25, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_25;
)

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