Uber says hacker group Lapsus$ behind cybersecurity incident

In a blog post on Monday, Uber (UBER) said the attackers first gained access to the company's systems when they successfully convinced a contractor to grant a multi-factor authentication challenge. The contractor's network password had likely been obtained separately on a dark web marketplace, Uber said.

"From there, the attacker accessed several other employee accounts which ultimately gave the attacker elevated permissions to a number of tools, including G-Suite and Slack," the blog post said. "The attacker then posted a message to a company-wide Slack channel, which many of you saw, and reconfigured Uber's OpenDNS to display a graphic image to employees on some internal sites."

The attacker did not access user-facing systems, user accounts, databases containing personal information or the code that powers Uber's products, the company said. But it added the investigation is continuing in coordination with law enforcement and multiple cybersecurity firms.

The blog post marks the first time Uber has publicly attributed the incident to the Lapsus$ gang, which targeted Microsoft earlier this year and is also accused of attacking Nvidia, Okta and other companies.