The cyber threat landscape is constantly evolving, with new threats and attacks emerging every day. While traditional cybersecurity measures like endpoint security and intrusion detection systems are designed to detect and prevent known threats based on predefined rules and signatures, they are all reactionary measures to cybersecurity.
Organizations need to look at cyber threat hunting. This approach ensures that security teams no longer wait for security alerts before swinging into action. Rather, they are continuously on the lookout for signs that could spell doom for the security apparatus of the organizations.
What is Cyber Threat Hunting?
Cyber threat hunting is an approach to security that involves searching for and identifying signs of malicious activity within a network before they cause damage or compromise data.
This approach operates under the assumption that despite an organization’s best efforts, skilled attackers may already be lurking within their network, lying in wait to execute malicious activities. So, rather than relying solely on reactive measures, threat hunting takes a proactive approach to finding these covert threats.
Security teams use a variety of threat-hunting tools like security information and event management (SIEM) for aggregated security data analysis, managed detection and response (MDR) for automated and human threat detection, security orchestration, automation and response (SOAR) to orchestrate monitoring and response workflows, and extended detection and response (XDR) which combines EDR, IAM, analytics, and automated response.
These solutions help threat hunters collect and analyze data across systems and networks, identify vulnerabilities and anomalous activities, and suggest ways these threats can be prevented from causing damage.
How Cyber Threat Hunting Works
Threat hunting requires building a dedicated team of experienced security personnel, often with backgrounds in intelligence analysis or investigative skills. These threat hunters are granted access to data sources across the organization’s infrastructure and systems, including network traffic, endpoint data, logs, and more.
In many cases, threat-hunting teams follow a framework that consists of five steps:
Leveraging their expertise, threat hunters often develop hypotheses around potential threats or anomalies that may be indicated in the data. They then proactively hunt through the data, using manual techniques and automated tools, looking for evidence. For example, a hypothesis around malware could make the team look for unusual outbound network traffic to a potential command and control server, which could indicate an attack or potential exploit.
To prove or disprove their hypothesis, they hunt through the data using manual techniques and automated tools. If indicators of compromise are found, the team escalates this to the incident response team for containment and remediation, providing key context and a basis for streamlining and enriching automated analytics for future cases.
Cyber Threat Hunting Techniques
Techniques for threat hunting differ from one organization to another and are mostly informed by the security infracture used in the organization. However, below are common threat-hunting techniques.
- Log analysis: This technique involves analyzing security logs and alerts generated by various systems and applications. The goal is to identify patterns or anomalies that could indicate a security threat.
- Network traffic analysis: Analyzing patterns and connections in network traffic can reveal unusual communications associated with malware, data exfiltration, or command and control.
- Endpoint analysis: This involves checking endpoints for unusual processes, registry keys, file changes, etc., that could signal the presence of malware, backdoors, or persistent threats.
- Behavioral analysis: Threat-hunting teams could look at patterns of user or system behaviors that deviate from norms, like unusual account activity, access requests, or large data transfers at odd hours.
- Data analytics: This technique includes applying statistical models, machine learning techniques, visualization tools, and other analytics to surface subtle anomalies and threat indicators in large, complex data sets.
- Memory dump analysis: This technique involves analyzing memory dumps, which are snapshots of a device’s random access memory (RAM) at a specific point in time. Some malware operates in memory to avoid detection, so this technique can be used to identify threats that traditional antivirus solutions might not catch.
- Analyzing server and endpoint data: This involves checking endpoint protection data for signs of suspicious activity and analyzing server images for threat activity. For example, if a workstation is communicating with a known malicious IP address, it could indicate a compromised system.
Why Threat Hunting Is Important
One of the benefits of threat hunting is that it can help organizations detect and eliminate advanced threats before they cause significant damage or data loss by reducing the time they remain undetected and active in the network.
Considering that the global average cost of a data breach is around $4.4 million, the financial implications are significant. This cost escalates the longer the gap between system compromise and response. Threat hunting can help reduce this number and save the organization from financial and reputational losses.
Threat hunting can also help organizations gain valuable insights and intelligence about the threat landscape, the attack vectors, the adversary tactics, techniques, and procedures (TTPs), and the indicators of compromise (IOCs), by collecting and analyzing data from various sources, both internal and external. These insights and intelligence can help improve the threat detection and prevention capabilities, as well as the threat response and mitigation strategies of the organization.
Applying threat hunting approach makes it possible for organizations to stay ahead of the curve as security teams do not wait for the organization to be attacked or for threat detection tools to raise an alarm before taking action. They operate by anticipating and preparing for future threats and attacks rather than reacting to them after they happen.
As such, threat hunting can help teams identify and exploit the weaknesses and vulnerabilities of the adversaries, thereby gaining a competitive edge and a strategic advantage over malicious actors.
Given the benefits of threat hunting in modern-day cybersecurity efforts, it is on organizations to find a way to incorporate threat-hunting strategies in their cybersecurity stack. This does not call for the abandonment of traditional threat-monitoring solutions. However, it requires creating a balance between both measures.
Regardless of the nature of the balance created, effective threat hunting will require not just a skilled security team but also comprehensive visibility into an organization’s environment as well as significant investments in threat hunting tools.