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DETECTION OVERVIEW

Unusual Interactive Traffic from a Remote Desktop

Risk Factors

Remote access software is a common target for attackers because of their prevalence in enterprise environments and they provide remote access to internal network devices. If an attacker collects system credentials, they can remotely control the desktop on the victim and potentially establish a command-and-control (C&C) channel.

The system might change the risk score for this detection.

Kill Chain

Command-and-Control

Risk Score

65

Detection diagram
Next in Command-and-Control: Unusual Interactive Traffic from an External Endpoint

Attack Background

Remote access software such as TeamViewer and remote service protocols such as the Remote Desktop Protocol (RDP), enable users to interact with the graphical user interface (GUI) of a device from a remote location. Attackers can remotely access devices after obtaining user credentials through phishing, device compromise, or brute force techniques. After connecting to the internal device, the attacker can establish a persistent presence, create an interactive C&C channel, or connect to other target systems within the network.

IT administrators often remotely interact with internal enterprise resources through remote desktop services. This legitimate activity can appear similar to malicious interactive remote desktop sessions.

Mitigation Options

Configure firewalls to block common remote service protocols, such as VNC (RFB) and RDP, to unknown external hosts

Disable or remove unnecessary desktop sharing software

Enforce multi-factor authentication for remote logins

Determine if any user credentials have been compromised for an unauthorized remote desktop connection

MITRE ATT&CK ID

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