ET POLICY Signed TLS Certificate with md5WithRSAEncryption

Query · suricata

flow:established,from_server;
content:"|16 03 01|"; depth:3;
content:"|02|"; distance:2; within:1;
byte_jump:3,0,relative,big;
content:"|16 03 01|"; within:3;
content:"|0b|"; distance:2; within:2;
content:"|30 82|"; distance:9; within:2;
content:"|30 82|"; distance:2; within:2;
content:"|a0 03 02 01 02 02|"; distance:2; within:6;
byte_jump:1,0,relative,big;
content:"|30 0d 06 09 2a 86 48 86 f7 0d 01 01 04 05 00|"; within:15;
Raw source ET POLICY Signed TLS Certificate with md5WithRSAEncryption · 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 POLICY Signed TLS Certificate with md5WithRSAEncryption";
    flow:established,from_server;
    content:"|16 03 01|"; depth:3;
    content:"|02|"; distance:2; within:1;
    byte_jump:3,0,relative,big;
    content:"|16 03 01|"; within:3;
    content:"|0b|"; distance:2; within:2;
    content:"|30 82|"; distance:9; within:2;
    content:"|30 82|"; distance:2; within:2;
    content:"|a0 03 02 01 02 02|"; distance:2; within:6;
    byte_jump:1,0,relative,big;
    content:"|30 0d 06 09 2a 86 48 86 f7 0d 01 01 04 05 00|"; within:15;
    reference:url,www.win.tue.nl/hashclash/rogue-ca/;
    reference:url,ietf.org/rfc/rfc3280.txt;
    reference:url,jensign.com/JavaScience/GetTBSCert/index.html;
    reference:url,luca.ntop.org/Teaching/Appunti/asn1.html;
    reference:url,news.netcraft.com/archives/2012/08/31/governments-and-banks-still-using-weak-md5-signed-ssl-certificates.html;
    classtype:misc-activity;
    sid:2015686; rev:3;
    metadata:created_at 2012_09_07, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.