Microsoft has introduced a new feature in Defender for Endpoint that enhances the detection of potentially compromised machines within an organization. This feature, known as the “DesktopName” field, allows analysts to identify and investigate suspicious interactive processes running on hidden desktops, which are increasingly being exploited through Remote Desktop Protocol (RDP) compromises. RDP usage has surged, particularly in ransomware operations, making it vital for analysts to have full visibility into any potentially malicious RDP session activities.
The new detection capability focuses on hidden desktops, which attackers use to gain unauthorized control over a user’s device without their knowledge. By exploiting the emergence of additional hidden desktop objects, attackers can interact with the device independently of the active desktop that the legitimate user sees. This method is particularly insidious because it allows attackers to operate in the background while the user remains unaware of the intrusion.
A specific technique used by attackers is Hidden Virtual Network Computing (hVNC), which leverages a Windows feature that allows multiple interactive desktops within a single user session. Through hVNC, attackers can create a hidden virtual desktop that runs parallel to the user’s current session, enabling them to control the device remotely while concealing their activity. This technique further complicates detection and makes it easier for attackers to evade traditional security measures.
Defender for Endpoint’s advanced detection capabilities, including the ability to hunt for suspicious processes on hidden desktops, provide administrators with crucial tools to detect and respond to these sophisticated attacks. By utilizing features like Advanced Hunting queries, administrators can gain detailed visibility into abnormal processes and stay ahead of the evolving threat landscape, ensuring better protection against RDP compromises and other forms of cyber threats.
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