Mimikatz is a powerful hacking tool that allows attackers to extract credentials from Windows systems, such as plaintext passwords, hashes, and Kerberos tickets. Detecting and preventing Mimikatz from running within an enterprise environment involves multiple layers of defense. Here are some steps you can take to protect your organization from Mimikatz:
- Patch and update: Regularly update and patch your operating systems and software, especially security-related patches. Microsoft has released several updates that can help mitigate the effectiveness of Mimikatz, such as KB2871997 and KB2928120.
- Use strong passwords: Encourage the use of strong, unique passwords for all accounts, and enforce password policies that require regular password changes.
- Enable Credential Guard: Enable Windows Credential Guard, a feature in Windows 10 and Windows Server 2016 that helps protect credentials from being extracted by tools like Mimikatz.
- Implement Least Privilege Principle: Limit user privileges and restrict administrative accounts to the minimum necessary access. This reduces the risk of an attacker gaining control of a high-privilege account.
- Implement User Behavior Analytics (UBA): UBA can help detect anomalous user behavior, such as unusual login attempts, that may indicate Mimikatz usage.
- Endpoint detection and response (EDR): Deploy EDR solutions that can detect and block known Mimikatz signatures and behaviors. Update the EDR software regularly to ensure the latest threat intelligence is used.
- Regularly review logs: Monitor and review security logs for suspicious activity, such as failed login attempts or unusual system access. Implement a Security Information and Event Management (SIEM) system to help automate this process.
- Network segmentation: Separate critical assets from the rest of the network to limit the potential damage from a Mimikatz attack.
- Two-factor authentication (2FA): Implement 2FA for sensitive systems and privileged accounts, making it harder for an attacker to gain access even if they have valid credentials.
- Security awareness training: Educate your employees about cybersecurity threats, including the risks posed by Mimikatz, and train them on how to recognize and report suspicious activity.
- Incident response plan: Develop and regularly update an incident response plan to ensure your organization can respond quickly and effectively to a security breach involving Mimikatz or other hacking tools.
By implementing these measures, you can reduce the risk of Mimikatz attacks and improve your organization’s overall cybersecurity posture.