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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.[1]


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.[2]

Incident responseEdit

If an incident does occur within the organization, the blue team will perform the following six steps to handle the situation:

  1. Preparation
  2. Identification
  3. Containment
  4. Eradication
  5. Recovery
  6. Lessons learned[3]

Operating system hardeningEdit

In preparation for a computer security incident, the blue team will perform hardening techniques on all operating systems throughout the organization.[4]

Perimeter defenseEdit

The blue team must always be mindful of the network perimeter, including traffic flow, packet filtering, proxy firewalls, and intrusion detection systems.[4]


Blue Teams employ a wide range of tools allowing them to detect an attack, collect forensic data, perform data analysis and make changes to threat future attacks and mitigate threats. Some of the tools include:

Log Management and AnalysisEdit

Security Information and Event Management (SIEM) TechnologyEdit

SIEM software supports threat detection and security incident response by performing real-time data collection and analysis of security events. This type of software also uses data sources outside of the network including Indicators of Compromise (IoC) threat intelligence.

See alsoEdit


  1. ^ Sypris Electronics. "DoDD 8570.1: Blue Team". Sypris Electronics. Retrieved July 3, 2016.
  2. ^ Johnson, Rowland. "How your red team penetration testers can help improve your blue team". SC Magazine. Archived from the original on May 30, 2016. Retrieved July 3, 2016.
  3. ^ Murdoch, Don (2014). Blue Team Handbook: Incident Response Edition (2nd ed.). reateSpace Independent Publishing Platform. ISBN 978-1500734756.
  4. ^ a b SANS Institute. "Cyber Guardian: Blue Team". SANS. SANS Institute. Retrieved July 3, 2016.