The outside resources involved in the Target data breach of 2013 included investigative bodies and cybersecurity experts engaged in comprehensively understanding, analyzing, and addressing the repercussions of the breach. Additionally, third-party contractor Fazio Mechanical Services, which fell victim to a phishing attack, was identified as a pivotal external entity. It was through this initial compromise that the malefactors gained unauthorized access to Target's systems, highlighting the interconnected and far-reaching nature of such cybersecurity incidents.

Sources

[PDF] A “Kill Chain” Analysis of the 2013 Target Data Breach - Senate Commerce CommitteeWarnings (& Lessons) of the 2013 Target Data Breach - Red River TechnologyTarget Data Breach: How Was Target Hacked? - IDStrongCase Study: What We've Learned from the Target Data Breach of 2013 - CardConnectSources: Target Investigating Data Breach - Krebs on SecurityAnatomy of a data breach – what we learned from Target - Entech

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