Cybersecurity Case Study on Healthcare Acquisition

This case study documents a cybersecurity incident following a corporate acquisition where security monitoring tools identified suspicious login activity in the acquired company's Microsoft 365 environment. An investigation revealed a long-standing account compromise that had been exploited to create unauthorized Azure infrastructure for phishing campaigns, resulting in over $10,000 in fraudulent charges. The acquired company lacked adequate cloud security controls and monitoring systems, allowing the unauthorized access to persist undetected for over a year. The incident had significant business impacts, including financial losses and potential reputational damage. The case study outlines preventative recommendations, such as conducting thorough security assessments during acquisitions, deploying comprehensive monitoring tools, enforcing multi-factor authentication, and implementing least-privilege access controls. Immediate response actions included securing the compromised account and removing unauthorized infrastructure to mitigate further risks.