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Security for System

Security for System Environments: A 2025 Field Guide

The Breach That Started With a Single Unpatched System In February 2024, UnitedHealth Group's subsidiary Change Healthcare suffered a ransomware attack that disrupted healthcare payment processing across the United States for weeks. The attackers gained access through a Citrix remote access portal that lacked multi-factor authentication. One system.

Carl B. Johnson Nov 06, 2025 7 min read
Security for System

Security for System Hardening: A Practical Guide

In February 2024, a misconfigured system at Change Healthcare led to one of the most devastating ransomware attacks in U.S. healthcare history. The ALPHV/BlackCat group exploited a Citrix remote access portal that lacked multi-factor authentication — a basic security for system control that should have been in place years

Carl B. Johnson Jul 10, 2024 7 min read
Security for System

Security for System Environments: A Practical Guide

In March 2022, Okta confirmed that the Lapsus$ threat actor group had compromised a support engineer's laptop and accessed internal systems for five days before detection. Five days. That's an eternity when an attacker has a foothold inside your environment. The breach highlighted a brutal truth:

Carl B. Johnson Aug 11, 2022 7 min read