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Deprecated - Potential Non-Standard Port SSH connection

Identifies potentially malicious processes communicating via a port paring typically not associated with SSH. For example, SSH over port 2200 or port 2222 as opposed to the traditional port 22. Adversaries may make…

Description

Identifies potentially malicious processes communicating via a port paring typically not associated with SSH. For example, SSH over port 2200 or port 2222 as opposed to the traditional port 22. Adversaries may make changes to the standard port a protocol uses to bypass filtering or muddle analysis/parsing of network data.

Detection logic

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Detection requirements

Platform
ESXiLinuxmacOSWindows

The rule states no platform. This is derived from the ATT&CK technique it maps to.

Log source category
event_index

Known benign triggers

  • SSH over ports apart from the traditional port 22 is highly uncommon. This rule alerts the usage of the such uncommon ports by the ssh service. Tuning is needed to have higher confidence. If this activity is expected and noisy in your environment, consider adding exceptions - preferably with a combination whitelisted ports for such legitimate ssh activities.

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