SolarWinds hack was work of 'at least 1,000 engineers', tech executives tell Senate

True scope of the breach, which affected 100 companies and several federal agencies, is still unknown

Tech executives revealed that a historic cybersecurity breach that affected about 100 US companies and nine federal agencies was larger and more sophisticated than previously known.

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source https://www.theguardian.com/technology/2021/feb/23/solarwinds-hack-senate-hearing-microsoft