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March 26, 2024
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Firewalls are a staple in every enterprise environment and are typically the first line of defense protecting a network. They control the flow of traffic in and out of network boundaries based on a set of rules. The management of these rules will ultimately determine the level of security and protection a firewall provides. One of the fundamental rules in configuring a firewall is to deny all traffic by default, then create exceptions to allow services based on specific business needs. However, as business needs change over time, old policy exceptions may still be in effect. This increases the attack surface by leaving holes and weaknesses in the network perimeter. Hunting through firewall data isn’t only helpful for finding potentially malicious traffic; it also provides a look into general network traffic flow. Taking a broad look at what traffic is allowed out and from where will lead to a better understanding of how traffic is controlled outbound and where the gaps are.
As part of our Threat Hunting Use Case series, we’re sharing the use case below around outbound firewall traffic, developed and refined by our Research and Development teams, to help you get started threat hunting.
Objective: Baseline outbound network traffic using firewall logs to find perimeter weaknesses and identify anomalies that could indicate malicious network activity.
Log source & requirements: Firewall logs from Application-/Protocol-aware Firewalls
Duration: 7–14 Days
Related MITRE techniques: T1048 and T1030, T1071, T1571, and T1572
By aggregating and normalizing your data from disparate tools, such as SIEM, EDR, multi-cloud, and third-party applications, ReliaQuest GreyMatter allows your team to run focused hunt campaigns, both packaged and freeform, that are strategic and iterative. Use ReliaQuest GreyMatter to analyze indicators of compromise retrospectively or perform behavior assessments to visualize abnormal from normal activity.
Ready to kick-start your threat-hunting program? Get the white paper: Threat Hunting 101.
Check out the other blogs in our Threat Hunting Use Case Series: