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DETECTION OVERVIEW

New SSH Connection to a Non-Standard Port

Risk Factors

SSH is a common target for attackers because it provides remote control access to other devices. An attacker can easily change a compromised device to communicate on a non-standard port to evade detection. This type of traffic usually does not negatively affect the network, but obscuring the connection helps an attacker bypass monitoring so they can take steps to discover and exploit other vulnerabilities.

Category

Command-and-Control
Detection diagram
Next in Command-and-Control: New Tunneling Software Activity

Background

The standard port for SSH traffic is port 22. To establish a secure command-and-control (C&C) channel or persistence on a victim device, an attacker sets up an SSH server on a non-standard port. These ports help the attacker evade port-based firewall rules and IDS rules that prevent unauthorized SSH traffic. After an attacker establishes this hidden encrypted connection, they can launch further attacks on the network.

Mitigation Options

Quarantine the client device while checking for indicators of compromise, such as the presence of malware

Block outbound connections to suspicious external hosts

Implement network segmentation, security zones, and firewall policies that limit how devices can communicate.

MITRE ATT&CK ID

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