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DETECTION OVERVIEW

Logged-On User Enumeration

Risk Factors

Enumeration is a simple but important step taken by attackers after an initial network compromise. Reconnaissance tools such as BloodHound make enumeration relatively easy to perform. Enumeration activity typically does not negatively affect the network, but attackers can identify high privilege users as a precursor to lateral movement or additional attacks.

The system might change the risk score for this detection.

Kill Chain

Reconnaissance

Risk Score

37

Detection diagram
Next in Reconnaissance: Net Group Enumeration Attempt

Attack Background

After infiltrating a network, an attacker typically looks for privileged users as their next target. To find these users, an attacker might connect to directory services or accounts to enumerate users, administrators, domains, or groups on the network. Active Directory (AD) is the directory service in a domain-based Windows environment. One approach for enumerating active users is to send Microsoft remote procedure call (MSRPC) queries to the Microsoft Workstation Service Remote Protocol (MS-WKST) interface. An attacker with administrator privileges retrieves a list of users that are currently logged into the server. An attacker without administrator privileges only learns about the login status of the victim.

Mitigation Options

Monitor and investigate unusual activity quickly to minimize potential damage

Limit the number of users with local administrator privileges in your environment

MITRE ATT&CK ID

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