Ukraine Denial of Service Attack

By: Eric Vicencio

It was recently reported that Ukraine had been hit with various cyberattacks. This included data-wiping malware and a denial-of-service (DoS) attack, which affected their military, government sites, and economy.

What is a DoS? A denial-of-service (DoS) attack occurs when legitimate users are unable to access information systems, devices, or other network resources due to the actions of a malicious cyber threat actor. Services affected may include email, websites, online accounts (e.g., banking), or other services that rely on the affected computer or network. A denial-of-service condition is accomplished by flooding the targeted host or network with traffic until the target cannot respond or simply crashes, preventing access for legitimate users. (

The United States Department of Homeland Security and the FBI has warned of potential cyber attacks on US-based companies or companies that do business with Ukrainian companies. We suggest taking extra caution for the foreseeable future and ensuring that all hardware and software are patched and up to date. As always, report anything that looks suspicious.

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About the Author: Eric Vicencio

Eric began his career in healthcare, and he has been working in the IT field since 2006 when he graduated from Northern Illinois University. Eric specializes in Infrastructure, SQL and compliance: Licensing, HIPAA, GLBA and PCI.