More than 1,000 hackers probably worked on the SolarWinds attack

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Microsoft's analysis of SolarWinds 'computer hacking suggests that the malicious code used in the attack on SolarWinds' supply chain was developed by about 1,000 developers.  Microsoft President Brad Smith called the incident "the largest and most sophisticated attack the world has ever seen."

 “It is probably fair to say that this is the largest and most complex attack ever to take place in the world.  This is the first use of supply chain disruption tactics against the US, ”CBS News quoted Smith as saying.

According to FireEye CEO Kevin Mandia, the cyberattack was identified when a two-factor authentication attempt at their company raised suspicion.

 “A FireEye employee logged into the system, and our security personnel discovered that the user had two phones registered in his name.  The specialists called this person and asked if he really registered the second device on the network.  The employee replied that he did not do it, ”said Mandia.

The discovery of this activity led to further investigations into the SolarWinds hack and the Orion software compromise.
As the experts explained, during the investigation it was revealed that hackers in total rewrote 4032 lines of Orion code, which formed the basis of the cyberattack.