Omar Marques / SOPA Images/Sipa USA via AP Images In this photo illustration a Microsoft logo seen displayed on a smartphone with stock market values in the background. The Hafnium group has historically targeted 'infectious disease researchers, law firms, higher education institutions, defense contractors, policy think tanks and NGOs,' Burt wrote in a company blog post. It was literally hack everybody you can in this short time window and cause as much pandemonium and mayhem as possible.' 'In this specific case, there was zero rhyme or reason for who were hacking. But the mass hacking going on here is literally the largest hack I've seen in my fifteen years,' said David Kennedy, CEO of cybersecurity firm TrustedSec.

Mandia said 550 of his employees are working remotely and responding to a recent barrage of cyber breaches, including four different zero-day attacks against Microsoft Exchange. The CEO of FireEye Kevin Mandia gives a tour of the cybersecurity company's unused office space in Reston, Va., Tuesday, March 9, 2021. The breach follows last year's Russian-linked hack, which leveraged SolarWinds software to spread a virus across 18,000 government and private computer networks. The National Security Council has assembled a multi-agency government task force to address the massive breach.

President Joe Biden has been briefed on the attack, and discussed it with leaders from India, Japan and Australia at a summit Friday, said National Security Advisor Jake Sullivan. The fallout from the hack is still being measured.

Microsoft to do hacks