ExtraHop named a Leader in the 2025 Forrester Wave™: Network Analysis And Visibility Solutions

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DETECTION OVERVIEW

New Outbound RDP Connection

Risk Factors

Remote Desktop Protocol (RDP) is a common target for attackers because it provides remote access to Windows devices. It is relatively easy to guess weak passwords and then attempt to connect to target devices over RDP. But the impact to a business can be low if the RDP connection is not authenticated, 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.

Category

Command-and-Control
Detection diagram
Next in Command-and-Control: New Outbound SOCKS Connection

Attack Background

RDP is a feature that enables remote management of a device through a graphical user interface. An attacker can establish an interactive command-and-control (C&C) RDP channel to remotely access a target device and transfer files. Before the attacker can successfully gain access to the target device over RDP, the attacker often needs to acquire the credentials of a user to establish the RDP connection. When the RDP connection is established, the attacker can maintain communication with the target device and take the next steps towards their ultimate attack objectives.

Mitigation Options

Disable RDP on devices that do not require remote access

Remove the default local Administrators group from the list of approved RDP groups and add specific users to the list

Enforce multi-factor authentication for remote logins

Only allow incoming external RDP connections from trusted devices

Limit the number of RDP login attempts, and then lock user accounts that exceed this number

Enforce security zones by implementing network segmentation and firewall policies to limit how devices can communicate

MITRE ATT&CK ID

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