The UK’s National Cyber Security Centre (NCSC) has introduced a groundbreaking initiative called the ‘Share and Defend’ capability, aimed at enhancing the nation’s defenses against cyber attacks and cyber-enabled fraud. This collaborative effort brings together service providers, businesses, and the public to block malicious websites and protect critical infrastructure. For cybersecurity professionals, including Red Teamers, Blue Teamers, SOC Analysts, and Threat Intel Researchers, this development marks a significant advancement in collective cyber defense.
Key Takeaways for CISOs
- What is ‘Share and Defend’? A new NCSC capability enabling collaboration with ISPs and tech companies to block access to malicious websites using threat intelligence and data sharing.
- How does it work? By leveraging real-time threat intelligence, the system identifies and blocks malicious domains before they can be used in cyber attacks.
- Why is it important? It enhances the UK’s resilience against cyber-enabled fraud and attacks, reducing the attack surface for businesses and individuals.
- Who benefits? Service providers, businesses, and the public, with a focus on protecting critical infrastructure and sensitive data.
Technical Details of ‘Share and Defend’
The ‘Share and Defend’ capability operates by enabling Internet Service Providers (ISPs) and technology companies to block access to malicious websites in real time. This is achieved through the sharing of threat intelligence and data from the NCSC, which identifies domains associated with cyber crime, including phishing, malware distribution, and cyber-enabled fraud.
How It Works
- Threat Intelligence Sharing: The NCSC collects and analyzes data on malicious domains, often sourced from its Active Cyber Defence (ACD) program.
- Real-Time Blocking: ISPs and tech companies receive this intelligence and implement measures to block access to these domains.
- Collaborative Defense: By working together, service providers and the NCSC create a unified front against cyber threats, reducing the likelihood of successful attacks.
Relevance to Cybersecurity Professionals
- Red Teamers: This capability could impact offensive operations by reducing the availability of malicious infrastructure. Red Teams should be aware of the increased likelihood of domain takedowns and adapt their tactics accordingly.
- Blue Teamers: The shared threat intelligence can be integrated into existing defenses, such as firewalls and intrusion detection systems, to enhance protection.
- SOC Analysts: Real-time blocking of malicious domains reduces the volume of alerts related to phishing and malware, allowing analysts to focus on more sophisticated threats.
- Threat Intel Researchers: The NCSC’s data sharing provides valuable insights into emerging threats and adversary tactics, techniques, and procedures (TTPs).
Proof of Concept: Automating Threat Intelligence Integration
For SOC Analysts and System Administrators, integrating NCSC’s threat intelligence into existing workflows can be streamlined using Python. Below is a sample script to automate the ingestion of malicious domain data:
import requests
import json
# Fetch NCSC threat intelligence feed
def fetch_ncsc_feed():
url = "https://www.ncsc.gov.uk/api/threat-intelligence-feed"
response = requests.get(url)
if response.status_code == 200:
return response.json()
else:
print("Failed to fetch feed")
return None
# Block malicious domains using firewall rules
def block_domains(domains):
for domain in domains:
print(f"Blocking domain: {domain}")
# Example: Add firewall rule using iptables (Linux)
# os.system(f"iptables -A INPUT -s {domain} -j DROP")
# Main function
if __name__ == "__main__":
feed = fetch_ncsc_feed()
if feed:
malicious_domains = feed.get("malicious_domains", [])
block_domains(malicious_domains)
This script demonstrates how to fetch the NCSC’s threat intelligence feed and block malicious domains using firewall rules. Adjustments can be made to integrate with specific security tools or platforms.
Future Implications and Recommendations
The ‘Share and Defend’ capability is a significant step toward a more collaborative approach to cybersecurity. However, its success depends on widespread adoption and integration by ISPs, tech companies, and cybersecurity teams. Here are some recommendations for professionals:
- For CISOs: Advocate for participation in the ‘Share and Defend’ program within your organization and with your service providers.
- For SOC Analysts: Regularly update your threat intelligence feeds to include NCSC data and automate blocking mechanisms.
- For Red Teamers: Stay informed about the domains being blocked and adjust your infrastructure accordingly to avoid detection.
- For Threat Intel Researchers: Leverage the NCSC’s shared data to enhance your understanding of adversary behavior and improve your threat models.
Conclusion
The NCSC’s ‘Share and Defend’ capability represents a proactive and collaborative approach to combating cyber threats. By enabling real-time blocking of malicious domains and fostering partnerships across the cybersecurity community, this initiative strengthens the UK’s defenses against cyber crime. For cybersecurity professionals, it offers new opportunities to enhance defenses, streamline operations, and stay ahead of adversaries.
