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Network Security Threats

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Trojan Horse Malware

Trojan Horse Malware: What It Really Does Inside Your Network

The Invoice That Took Down a Hospital Network In 2023, a hospital system in Illinois watched helplessly as Qakbot — a trojan horse malware strain — moved laterally through its entire Active Directory environment in under four hours. The initial infection? A single employee opened what looked like an overdue vendor invoice

Carl B. Johnson May 09, 2026 5 min read