Because SSL negotiations are transmitted in the clear, it’s possible to fingerprint and identify client applications using the details in the SSL Client Hello packet. The server, if accepting SSL connections, will respond with a SSL Server Hello packet that is formulated based on server-side libraries and configurations as well as details in the Client Hello. This packet and the way in which it is generated is dependant on packages and methods used when building the client application. To initiate a SSL session, a client will send a SSL Client Hello packet following the TCP 3-way handshake. TLS and it’s predecessor, SSL, I will refer to both as “SSL” for simplicity, are used to encrypt communication for both common applications, to keep your data secure, and malware, so it can hide in the noise. ListsĮxample lists of known JA3's and their associated applications can be found here.Ī more up-to-date crowd sourced method of gathering and reporting on JA3s can be found at. Please be aware that these are just examples, not indicative of all versions ever. While destination IPs, Ports, and X509 certificates change, the JA3 fingerprint remains constant for the client application in these examples across our sample set.
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