Blue Team

What is a Blue Team?

A blue team is a group of individuals who perform an analysis of information systems to ensure security, identify security flaws, verify the effectiveness of each security measure, and to make certain all security measures will continue to be effective after implementation.

As part of the United States computer security defense initiative, red teams were developed to exploit other malicious entities that would do them harm. As a result, blue teams were developed to design defensive measures against such red team activities.

Source: Wikipedia

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During cyber security testing engagements, blue teams evaluate organizational security environments and defend these environments from red teams. These red teams play the role of attackers by identifying security vulnerabilities and launching attacks within a controlled environment. Both teams combine to help illuminate the true state of an organization’s security.

The idea that you can better understand your defenses by attacking them in a controlled environment is a long-established military principle. This idea is most commonly expressed in the practice of “red teaming,” where an outside group of independent actors tests the systems or defenses of a target organization to identify any existing vulnerabilities.

In the world of information security, the practice of red teaming is now well established. Red teams, who act as “ethical hackers,” methodically study an organization’s structure and defenses and then launch attacks to exploit any weaknesses.

Yet red teams are only part of the equation. On the other side stand “blue teams” — security professionals who are tasked with defending an organization’s systems and assets against attacks, both real and simulated.

Source: XM Cyber

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As defenders against attackers, the blue team is a team of incident response members who mitigate and prevent cyber threats. They work with experts to implement measures and patch vulnerabilities in the security systems.

They also detect suspicious activities by monitoring the organization's network, systems, and applications. The team also analyzes logs and network traffic to identify any anomalies that may indicate an attempted breach. Once detected, the team quickly moves to contain and remediate the threat.

Source: Splunk