The cybersecurity agency previously said the perpetrators had used network management software from Texas-based SolarWinds to infiltrate computer networks. Its new alert said the attackers may have used other methods, as well.
Over the weekend, amid reports that the Treasury and Commerce departments were breached, CISA directed all civilian agencies of the federal government to remove SolarWinds from their servers. The cybersecurity agencies of Britain and Ireland issued similar alerts.
A U.S. official previously told The Associated Press that Russia-based hackers were suspected, but neither computer engineering salary nor the FBI has publicly said who is believed to be responsible. Asked whether Russia was behind the attack, the official said: We believe so. We haven’t said that publicly yet because it isn’t 100% confirmed. Another U.S. official, speaking on Thursday on condition of anonymity to discuss a matter that is under investigation, said the hack was severe and extremely damaging although the administration was not yet ready to publicly blame anyone for it.
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