External Data’s Role in Cyber-Defense
In the Background way too Long…
Nagrecha and Chawla’s (2106) and Zuech et al.’s (2015) works are historical and seminal to the study of a major gap in the current cyber-defensive solution market. Their works form the groundwork of the study, where they identify other disciplines use and reliance upon external data as a critical component of better intrusion detection and risk response actions (Walters, n.d.). External or Heterogeneous data are specifically described by these authors as essential to increasing organizational visibility and awareness of all types of risks and threats to IT environments and networks (Nagrecha & Chawla, 2106; Zuech et al., 2015).
Zuech et al. (2015) specifically discuss the importance of external or heterogeneous datasets as valuable for cyber-intrusion detection measures. They emphasize the difficulties of integrating disparate data types, to include internal and external datasets, that remain problematic to managing and integrating into predictive model (Gupta & Rani, 2018; Zuech et al., 2015). External data offers increased analytical usefulness to business, industry, and government in defending against cyber-attacks.
Zuech et al. (2015) ultimately suggest that a problem that organizations have is that they are “focused too narrowly on the [local/internal] network layer” (Zuech et al., 2015, p. 38). Organizations fail to incorporate effective intelligence about the broader threat environment creating serious gaps in their network defenses. Zuech et al. (2015) further suggest a need for enhanced data “beyond [local] cyberspace such as sensor devices” on and beyond the IT security perimeter. These devices could exist on the edge or exterior to organizational security boundary to provide greater defense in depth(p. 38). Their overall recommendation is to aggregate and effectively use all available data in improving a capable predictive solution.
Structured Threat Information eXpression (STIX)
One U.S. government attempt to introduce external data to the public and private sectors is its introduction of the STIX formatting standard in 2010 (MITRE, 2010). A significant finding of the 9-11 Commission was the lack of information sharing between the various members of federal law enforcement and the intelligence community in anticipating the fateful attacks of September 11, 2001 (Director of National Intelligence [DNI], 2018; National Commission on Terrorist Attacks upon the United States [NCTAUS], 2004); information sharing has an associative relationship with this failure of external data sharing and application. The failure of information sharing underscores a serious problem posed culturally to any solution to cybersecurity defense. An awareness of this topic isolates an important non-technical reason for the lack of employment of external data in general.
The STIX effort was championed by the U.S. government to provide expanded communications of cyber-threat data among companies, agencies, and organizations. The effort was launched by the Department of Homeland Security (DHS) in its creation of STIX for consideration by the private sector to better defend against cyber-threats (MITRE, n.d.; HSSEDI, n.d.). Specifically, the STIX format met the exchange requirements for a threat intelligence standard between the federal government and the private sector.
STIX was formulated to explicitly support cyber-threat intelligence needs so threat data “can be shared, stored, and analyzed in a consistent manner” (STIX Project, 2018). “STIX is a collaborative, community-driven effort to define and develop a structured language to represent cyber threat information” (MITRE, n.d.). It was meant to foster closer coordination between the private and public sectors regarding cybersecurity activities that could be incorporated into automated tools to assist in better awareness and predictive threat counter-measures.
Waterman (2017) describes the ongoing failure of information sharing attempts by the federal government, he reports that “everyone wants to receive information, but few are prepared to make an effort to give back” (para. 1). The 2015 Cybersecurity Act offered a “safe harbor for companies” (para. 5). The 2015 Act included protections from criminal and civil liability for disclosing penetrations or vulnerabilities to an organization’s network by individuals or business entities; however, the desire of most firms still exists to avoid reporting for its reputational and ultimately its long-range profitability concerns (Waterman, 2017).
The weakness of information sharing adds to the challenges of cybersecurity protection. Kulp (2019) suggests that information sharing and external intelligence are vital to any threat response. Improved distribution means of threat data has a relationship with the long-term premise of this study; if time-sensitive data is not available, the threat will continue to exploit network gaps faster than the cyber-defenders can defend.
Honeypots as Exceptional External Datasets
External or heterogeneous data can come from various types and sources to form the basis of strategic insight and intelligence of the threat IT environment (Ng et al., 2018; Spitzner, 2003). Sources may include the U.S. federal government to include, for example, STIX, or other sources designed to identify risks in-the-wild, for example, honeypots or honeynets. These sources are extraordinary and valuable to enhance the experimental design.
Fang et al. (2019) recognize the value of honeypot data. They describe honeypots as able to passively monitor the IT environment and provide datasets that “exhibit rich phenomena” beneficial to identifying threats (p. 1). The advent of effective IT deception environments, to include honeypots, enhance the study’s data collection and analysis efforts (Fang et al., 2019; Spitzner, 2003). Honeypots afford an excellent means to sample the global IT environment for threat activities in a controlled and substantive manner to understand threat actions in cyberspace (Ng et al., 2018).
Basam, Ransbottom, Marchany, and Tront (2016) explored the use of honeypots with the Moving Target Internet Protocol version 6 Defense (MT6D) model. The MT6D model employs “radio-frequency hopping behavior” to avoid detection in cyberspace (p. 1). Essentially, the MT6D nodes [computers] can query the deployed honeypot’s classic relational database to identify changes in traffic. Specifically, their work attempts to discern malicious IP addresses from an active connection to a network to their experimentally-designed honeypot threat database; however, they do not apply a data science-based solution or method (Basam et al., 2016).
Another example where honeypots are used in cybersecurity defense is the work of Gabriel, Robson de, Flavio, Rafael, de Oliveira, García, and Tai-Hoon (2017). Their work relies on deep-packet inspection of network traffic using honeypot data (Gabriel, Robson de, Flavio, Rafael, de Oliveira, García, & Tai-Hoon, 2017). One of the key strengths of their approach is its ability to query at the deeper packet-by-packet level. This approach affords an ability to see everything within unencrypted data packets to discern a threat. Interestingly, during their study, they discovered a predominance of unauthorized IP traffic originating from China (Gabriel et al., 2017); a significant cyber-threat as identified in many parts of the cybersecurity community (Allyn, 2019; Mandiant, 2013).
Unfortunately, Gabriel et al.’s (2017) work rely heavily on manual processes. They self-describe a limitation of their work that was due to the “nonexistence of a data pipeline, which does not allow real-time analysis of payloads” (p. 24); their work fails to create an active model that can continuously monitor the environment and determine actions in real-time. However, their work does highlight the importance of heterogeneous data where a honeypot is employed and affords an exceptional means to collect threat TTPs. (Gabriel’s et al., 2017)
Conclusion
External or heterogeneous data offer significant improvements in current and developing efforts to leverage data science. While much of the focus is on the cyber-threat that has already penetrated the agency or corporate security boundary, external data are the expected next evolution of the cyber-defense problem. Not just better algorithms but better data that will anticipate the threats in real-time is more likely where progress will occur.
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Dr. Russo is currently the Senior Data Scientist with Cybersenetinel AI in Washington, DC. He is a former Senior Information Security Engineer within the Department of Defense’s (DOD) F-35 Joint Strike Fighter program. He has an extensive background in cybersecurity and is an expert in the Risk Management Framework (RMF) and DOD Instruction 8510, which implement RMF throughout the DOD and the federal government. He holds a Certified Information Systems Security Professional (CISSP) certification and a CISSP in information security architecture (ISSAP). He has a 2017 Chief Information Security Officer (CISO) certification from the National Defense University, Washington, DC. Dr. Russo retired from the US Army Reserves in 2012 as a Senior Intelligence Officer.