Network fingerprinting is a critical technique for identifying and analyzing network traffic patterns, particularly in encrypted protocols.
Two modern tools, HASSH and JA4+SSH, have emerged as powerful solutions for fingerprinting Secure Shell (SSH) traffic, enabling enhanced security, anomaly detection, and forensic analysis.
HASSH, developed by Ben Reardon of Salesforce’s Detection Cloud Team, is an open-source network fingerprinting standard designed for SSH traffic.
It generates unique fingerprints for SSH clients (hassh) and servers (hasshServer) based on the algorithms exchanged during the SSH handshake process.
These fingerprints are derived from clear-text packets in the SSH_MSG_KEXINIT phase and are stored as MD5 hashes.
JA4+SSH, part of the JA4+ suite created by John Althouse, extends fingerprinting capabilities to SSH traffic by analyzing behavior patterns and anomalies.
It is particularly effective in detecting unauthorized activities and malicious behavior.
loot.gz
) from compromised bastions.linpeas.sh
) to a bastion.Both HASSH and JA4+SSH represent significant advancements in network fingerprinting for SSH traffic.
By leveraging these tools, organizations can enhance their security posture, detect malicious activities, and gain deeper insights into encrypted communications. For further exploration, refer to the official articles on HASSH and JA4+SSH.
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