S government agencies by taking advantage of the widespread use of software from Solar Winds Corp.

It was not immediately clear how many Microsoft users were affected by the tainted products.

The U.

S Energy Department also said they have evidence hackers gained access to their networks as part of the massive cyber campaign.

This news comes as the Department of Homeland Security said earlier Thursday that the hackers used multiple methods of entry and that it is continuing to investigate the matter.

Solo Win set up to 18,000 of its customers had downloaded a compromise software update that allowed hackers to spy unnoticed on businesses and agencies for almost nine months.

So far, the Attackers unknown toe have at least monitored email or other data within the U.

S.

Department of Defense, state, Treasury, Homeland Security and Commerce.

Top senators in Congress are seeking answers into the hacking attack and whether the data of millions of American taxpayers was compromised.