Many cybersecurity incidents do not end with the compromise of a single computer. In fact, experienced attackers often view the first compromised device as only the beginning of their operation. Their next objective is to move throughout the network, identify valuable assets, and gain access to systems containing sensitive data. This phase of an attack is known as Lateral Movement.
For Security Operations Center (SOC) analysts, detecting lateral movement is one of the most important responsibilities during an investigation. Early detection can prevent attackers from reaching domain controllers, file servers, or other critical infrastructure. By using the MITRE ATT&CK framework alongside guidance from the NIST Cybersecurity Framework (CSF), analysts can better understand attacker behaviour and improve their detection strategies.
What Is Lateral Movement?
Lateral movement occurs when an attacker uses one compromised system to access additional systems within the same environment. Rather than remaining on the initial host, the attacker expands their access to increase privileges, locate sensitive information, or establish persistence across the network.
Within the MITRE ATT&CK framework, lateral movement includes techniques such as T1021 – Remote Services, which covers protocols including Remote Desktop Protocol (RDP), Secure Shell (SSH), and Server Message Block (SMB). Attackers may also abuse Valid Accounts (T1078) if they have successfully stolen legitimate user credentials.
Because these techniques often rely on standard administrative tools, distinguishing malicious activity from normal system administration can be challenging.
Indicators That May Suggest Lateral Movement
Lateral movement rarely consists of a single event. Instead, analysts should look for patterns that suggest an attacker is expanding their access.
Examples include:
- A privileged account authenticating to multiple servers within a short period.
- An unexpected Remote Desktop connection to a critical server.
- Administrative accounts logging in outside normal business hours.
- Multiple successful network logons using Event ID 4624 with Logon Type 3 or Logon Type 10.
- Endpoint Detection and Response (EDR) alerts indicating remote process execution.
None of these activities automatically indicate malicious behaviour. System administrators often perform similar tasks during maintenance or troubleshooting. However, unusual timing, unfamiliar source devices, or unexpected user accounts should prompt further investigation.
Using NIST to Strengthen Detection
The NIST Cybersecurity Framework encourages organizations to build security programs that emphasize continuous monitoring, access control, and incident response.
From a defensive perspective, organizations should restrict administrative privileges using the Principle of Least Privilege and monitor authentication activity involving privileged accounts. Collecting Windows Security logs, endpoint telemetry, firewall logs, and authentication records allows SOC analysts to correlate events across multiple systems.
Well-defined incident response procedures also help analysts investigate suspicious authentication activity consistently and reduce the time required to contain an attack.
Conclusion
Lateral movement is one of the most critical stages of a cyberattack because it allows attackers to extend their control beyond the initial compromised system. Detecting this behaviour requires more than monitoring individual logins or remote connections. Analysts must understand normal administrative activity, identify unusual authentication patterns, and correlate information from multiple security tools.
By applying the behavioural guidance provided by the MITRE ATT&CK framework and the defensive principles outlined in the NIST Cybersecurity Framework, SOC analysts can improve their ability to detect lateral movement before attackers reach high-value systems. In modern cybersecurity, identifying suspicious behaviour across multiple hosts is often far more valuable than focusing on a single alert.
Key Takeaways
Lateral movement allows attackers to expand access after the initial compromise.
MITRE ATT&CK techniques such as T1021 (Remote Services) and T1078 (Valid Accounts) are commonly associated with this activity.
Windows authentication events and EDR telemetry should be correlated rather than investigated in isolation.
NIST recommends continuous monitoring, least privilege, and structured incident response to reduce organizational risk.
Early detection of lateral movement can significantly limit the impact of a security incident.