VirusTotal has incorporated a powerful new tool to fight against
malware: JA4 client fingerprinting. This feature allows
security researchers to track and identify malicious files based
on the unique characteristics of their TLS client communications.
JA4: A More Robust Successor to JA3
JA4,
developed by
FoxIO, represents a significant
advancement over the older JA3 fingerprinting method. JA3’s
effectiveness had been hampered by the increasing use of TLS
extension randomization in https clients, which made
fingerprints
less consistent. JA4 was specifically designed to be
resilient to this randomization, resulting in more stable and
reliable fingerprints.
Unveiling the Secrets of the Client
Hello
JA4 fingerprinting focuses on
analyzing the
TLS Client Hello packet, which is sent unencrypted from
the client to the server at the start of a TLS connection.
This packet contains a treasure trove of information that can
uniquely identify the client application or its underlying
TLS library. Some of the key elements extracted by JA4
include:
- TLS
Version: The version of TLS supported by the[…]
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