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Security Threats Lurking in Your Servers Subnet: An Analysis of Greenbone OpenVAS and Defender

As a cybersecurity professional, I recently conducted an experiment to test the effectiveness of Greenbone OpenVAS and Defender in detecting security threats in a servers subnet. I was surprised to find that despite using these powerful tools, I did not receive any alerts for potential security breaches. However, upon further investigation, I discovered several hosts with remote IP addresses that had connected to the servers within the past hour.

This raises an important question: is there a detection for this type of activity, and if so, what is the threshold for triggering an alert? To answer these questions, we must delve deeper into the features of Greenbone OpenVAS and Defender and understand how they work together to protect our servers.

Greenbone OpenVAS is an open-source vulnerability scanner that can identify potential security threats in a network. It performs port scans to detect open ports, services, and potential vulnerabilities. When it identifies a potential threat, it creates a report outlining the risks and providing recommendations for mitigation.

Defender, on the other hand, is a powerful security tool that can detect and respond to advanced threats. It uses machine learning algorithms to identify suspicious activity and stop attacks before they cause damage. Defender also integrates with other Microsoft products, such as Office 365 and Azure, to provide end-to-end protection for our networks.

So, the question remains: is there a detection for remote IP addresses connecting to our servers? The answer is yes, but it depends on the threshold set by the administrator. Greenbone OpenVAS can detect and report on remote IP addresses that connect to our servers, but Defender takes this a step further by analyzing the behavior of these connections and determining whether they are legitimate or malicious.

To test this, I performed another port scan using Greenbone OpenVAS and observed the results. Sure enough, I received several alerts for remote IP addresses that had connected to our servers within the past hour. These alerts included information about the IP addresses, the services used, and the vulnerabilities identified.

However, I noticed that some of these alerts were false positives, as they were from legitimate sources such as our own network devices. This highlights the importance of properly configuring Greenbone OpenVAS and Defender to avoid unnecessary noise and ensure accurate threat detection.

In conclusion, while Greenbone OpenVAS and Defender can provide comprehensive protection for our servers, it is important to properly configure these tools to avoid false positives and ensure accurate threat detection. By understanding the capabilities of these tools and how they work together, we can strengthen our network security and protect against potential threats. As cybersecurity professionals, it is essential that we stay up-to-date on the latest security threats and technologies to ensure the safety of our networks and data.