SAN FRANCISCO (Reuters)-Microsoft Corp said on Thursday it found malicious software in its systems related to a massive hacking campaign disclosed by U.S. officials this week, adding a top technology target to a growing list of attacked government agencies.

The Redmond, Washington company is a user of Orion, the widely deployed networking management software from SolarWinds Corp which was used in the suspected Russian attacks on vital U.S. agencies and others.

Microsoft also had its own products leveraged to attack victims, said people familiar with the matter. The U.S. National Security Agency issued a rare “cybersecurity advisory” Thursday detailing how certain Microsoft Azure cloud services may have been compromised by hackers and directing users to lock down their systems.

Microsoft wants you to know this hack is even bigger than you think.

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Microsoft president Brad Smith warned that the wide-ranging hack of the SolarWinds’ Orion IT software is “ongoing,” and that investigations reveal “an attack that is remarkable for its scope, sophistication and impact.” The breach targeted several US government agencies and is believed to have been carried out by Russian nation-state hackers.

Smith characterized the hack as “a moment of reckoning” and laid out in no uncertain terms just how large and how dangerous Microsoft believes the hack to be. It “represents an act of recklessness that created a serious technological vulnerability for the United States and the world,” Smith argues.

He believes that it “is not just an attack on specific targets, but on the trust and reliability of the world’s critical infrastructure in order to advance one nation’s intelligence agency.” Though the post stops short of explicitly accusing Russia, the implication is very clear. “The weeks ahead will provide mounting and we believe indisputable evidence about the source of these recent attacks,” according to Smith.