Security News > 2021 > March > Microsoft Server Hack Has Victims Hustling to Stop Intruders

Victims of a massive global hack of Microsoft email server software - estimated in the tens of thousands by cybersecurity responders - hustled Monday to shore up infected systems and try to diminish chances that intruders might steal data or hobble their networks.

While the hack doesn't pose the kind of national security threat as the more sophisticated SolarWinds campaign, which the Biden administration blames on Russian intelligence officers, it can be an existential threat for victims who didn't install the patch in time and now have hackers lingering in their systems.

Cybersecurity analysts trying to pull together a complete picture of the hack said their analyses concur with the figure of 30,000 U.S. victims published Friday by cybersecurity blogger Brian Krebs.

David Kennedy, CEO of cybersecurity firm TrustedSec, said hundreds of thousands of organizations could have been vulnerable to the hack.

The hack did not affect the cloud-based Microsoft 365 email and collaboration systems favored by Fortune 500 companies and other organizations that can afford quality security.

The Cybersecurity Infrastructure and Security Agency issued an urgent alert on the hack last Wednesday and National Security Adviser Jake Sullivan tweeted about it Thursday evening.

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