Rule History

alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Possible JARM Fingerprinting Client Hello via tls1_3_reverse"; flow:established,to_client; content:"|16 03 01|"; startswith; content:"|00 05 00 04 00 07 00 c0 00 84 00 ba 00 41 00 9d c0 a1 c0 9d 00 3d 00 35 00 9c c0 a0 c0 9c 00 3c 00 2f 00 0a c0 11 cc 13 13 03 13 04 13 05 cc a8 c0 77 c0 76 c0 61 c0 60 c0 30 c0 28 c0 14 c0 2f c0 27 c0 13 c0 12 c0 07 cc 14 13 01 13 02 cc a9 c0 73 c0 72 c0 2c c0 af c0 ad c0 24 c0 0a c0 2b c0 ae c0 ac c0 23 c0 09 c0 08 00 9a 00 c4 00 88 00 be 00 45 00 9f c0 a3 c0 9f 00 6b 00 39 00 9e c0 a2 c0 9e 00 67 00 33 00 16|"; fast_pattern; content:"|08|http/0.9|08|http/1.0|08|http/1.1|06|spdy/1|06|spdy/2|06|spdy/3|02|h2|03|h2c|02|hq"; content:"|03 01 03 02 03 03 03 04|"; endswith; reference:url,engineering.salesforce.com/easily-identify-malicious-servers-on-the-internet-with-jarm-e095edac525a; classtype:misc-activity; sid:2036698; rev:2; 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, deprecation_reason Duplicate, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_03;)