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DETECTION OVERVIEW

Inbound SSH Traffic from an Unusual Location

Risk Factors

SSH is a common target for attackers because it provides remote control access to other devices. Attackers can find weak SSH passwords through low-cost techniques such as brute force attacks or by exploiting SSH server vulnerabilities to bypass authentication. The impact to a business can be low if the connection attempt fails or if the attacker connects to a device with limited privileges. However, these activities should be examined before they facilitate critical and costly attacks.

The system might change the risk score for this detection.

Kill Chain

Command-and-Control

Risk Score

41

Next in Command-and-Control: Inbound VNC Traffic from an Unusual Location

Attack Background

Mitigation Options

Disable internal services that are exposed to the internet, especially services that run over remote access protocols

Disable SSH unless required

Only allow incoming SSH connections from trusted devices, such as administrator workstations

Block outbound SSH connections unless required

Implement public-private key authentication, which is less susceptible to brute force attacks

MITRE ATT&CK ID

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