With the increasing complexity of cyberattacks, financial institutions need to implement more effective—and comprehensive—security measures. They need a variety of elements to create a layered approach to secure their data, infrastructure, and other resources from potential cyberthreats.
Many organizations rely on a castle-and-moat network security model where everyone inside the network is trusted by default. (Think of the network as the castle and the network perimeter as the moat.) No one outside the network is able to access data on the inside, but everyone inside the network can. However, security gaps may still exist in this model and others. The best approach to compensate for gaps is to surround the network with layers of security.
The basic “table stakes” for a layered security approach include a perimeter firewall with content filtering, email threat filters, an endpoint malware solution, and a robust patch management process. Banks and credit unions could also invest in additional and more sophisticated layers but each one will have associated acquisition and management costs, along with ongoing maintenance. So, it’s prudent for institutions to invest only in the number of layers/solutions they can competently manage.
Today the top IT security concern for many organizations is ransomware. Due to the proactive measures many financial institutions have taken, the banking industry has fewer security breaches than health care and some other industries thus far. However, when a breach does happen to a financial institution, the impact is more costly than breaches occurring in other industries.
Four-Layer Security Formula
With these concerns in mind, here’s a four-layer “recipe” organizations can employ to improve their security posture:
- Training and Testing: Using email phishing tests can serve as a good foundation for minimizing BEC and other social engineering threats.
- Network Design: Institutions should refresh older networks to segment their components into different zones. It’s no longer sufficient to have servers, workstations, and printers sitting in one IP space together.
- Domain Name System (DNS) filtering: DNS filtering prevents potentially damaging traffic from ever reaching the network. Because it proactively blocks threats, this makes it one of the most effective and affordable security layers institutions can apply.
- Endpoint Protection: Institutions should have this type of protection on each of their endpoints, and the best endpoint protection tools have built-in ransomware solutions.
Other Important Considerations
It’s important to back up data regularly and ensure that those backups are well beyond the reach of ransomware and other threats. (Backups done to a local server that’s on-site and are still on the network may be susceptible to ransomware.) One way to address this issue is to have immutable backups, which are backup files that can’t be altered in any way and can deploy to production servers immediately in case of ransomware attacks or other data loss. Another option is to send backups to a cloud solution like Microsoft Azure Storage, which is affordable and easy to integrate because there are no servers to manage.
Another crucial element in security is Transport Layer Security/Secure Sockets Layer (TLS/SSL) encryption protocol, which can be somewhat of a double-edged sword. About 80 percent of website traffic is encrypted to protect it from unauthorized users during transmission. Traditional firewalls don’t have the ability to scrutinize traffic against a content filtering engine, which means savvy hackers can hide ransomware and other dangerous content inside. But firewalls with advanced features are capable of TLS/SSL inspection; they can decrypt content, analyze it for threats, and then re-encrypt the traffic before entering or leaving the network.
There’s an array of security solutions that institutions can implement to establish layered protection against cyber threats. For more insights about this topic, listen to our webinar on “Cyber Threats, Why You Need a Layered Approach.”