Harnessing Zeek and ATT&CK for Effective Adversary Behavior Detection: A First-Person Perspective
As a cybersecurity professional, I’ve always been intrigued by the potential of open-source tools in enhancing our ability to detect and respond to adversary behaviors within network traffic. In this article, I will share my insights on how we can leverage the power of Zeek, a network security monitor and ATT&CK, a knowledge base of adversary tactics and techniques, to effectively hunt for potential threats.
In my experience, one of the key challenges in cybersecurity is managing the sheer volume of network traffic, particularly in a Windows environment. This is where the Server Message Block (SMB) and Remote Procedure Call (RPC) protocols come into play. These protocols are integral to Windows operations, facilitating functionalities such as file and print sharing, mapping network drives, and enabling remote access to system services.
I’ve found that these protocols, when scrutinized meticulously, can serve as potent indicators of a wide array of adversary behaviors. These behaviors extend beyond mere lateral movement to include execution, persistence, defense evasion, credential access, and discovery. By understanding the nuances of these protocols, we can enhance our ability to detect suspicious activities and respond effectively.
In my work, I’ve leveraged Zeek extensively to perform deep packet inspection of various network protocols. One of the key advantages of Zeek is its high degree of customizability. This allows me to tailor Zeek’s functionalities to my specific needs, thereby enhancing its effectiveness in detecting suspicious activities. Furthermore, Zeek’s authentication protocol analyzers and file extraction analyzer provide valuable insights into potential threats, enabling me to respond swiftly and effectively.
However, the utility of these tools extends beyond detection. They also serve as a foundation for developing robust security information and event management (SIEM) systems. If an organization can accommodate the RPC and SMB logs from Zeek, they can apply the logic underpinning these tools within their own systems, thereby enhancing their ability to detect and respond to potential threats.
Conclusion
As a cybersecurity professional, I’ve found that harnessing the power of Zeek and ATT&CK provides a potent tool for managing network traffic and detecting potential threats. However, it’s crucial to remember the importance of integrating network data with host data to build a comprehensive picture of suspicious activity. As the landscape of cybersecurity continues to evolve, tools like Zeek and ATT&CK will undoubtedly play an increasingly important role in safeguarding our digital ecosystems.
