Leading technology companies said Tuesday that a months-long breach of corporate and government networks was so sophisticated, focused and labor-intensive that a nation had to be behind it, with all the evidence pointing to Russia.
In the first congressional hearing on the breach, representatives of technology companies involved in the response described a hack of almost breathtaking precision, ambition and scope. The perpetrators stealthily scooped up specific emails and documents on a target list from the U.S. and other countries.
“We haven’t seen this kind of sophistication matched with this kind of scale,” Microsoft President Brad Smith told the Senate Intelligence Committee.
Forensic investigators have estimated that at least 1,000 highly skilled engineers would have been required to develop the code that hijacked widely used network software from Texas-based SolarWinds to deploy malware around the world through a security update.
“We’ve seen substantial evidence that points ...
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