Infamous hacker group claims to be selling data from over 70 million AT&T customers, according to a privacy group

• A hacker group claims to have stolen data from 70 million AT&T customers, according to RestorePrivacy.
• The group is trying to sell the data for $1 million on the dark web.
• AT&T has denied the hack, saying the information is not from its systems.

A known threat actor on the dark web with a history of cyber attacks is reportedly selling private data that was allegedly collected from AT&T users.

The group is attempting to sell the alleged database for $1 million, according to RestorePrivacy, who first reported the news.

RestorePrivacy, a website created to raise awareness about privacy and security issues, says it personally analyzed the data and found it included information such as "social security numbers, date of birth, and other private information" from AT&T's users.

"In the original post that we discovered on a hacker forum, the user posted a relatively small sample of the data," Sven Taylor of RestorePrivacy reported. "We examined the sample and it appears to be authentic based on available public records."

However, RestorePrivacy could not verify that that information belongs to AT&T customers. The hackers told RestorePrivacy that all data is from AT&T customers in the US, but could not disclose how they got the data.

AT&T denied the information was stolen from their serves according to a statement received by Gizmodo.

"Based on our investigation today, the information that appeared in an internet chat room does not appear to have come from our systems," the spokesperson said.

AT&T did not respond to Insider's request for comment.

The hacker group has stolen information in the past from companies like Microsoft, Mashable, MeetMindful, and Wishbone.

The alleged hack comes after over 53 million T-Mobile customers had their information stolen in a cyber security attack earlier this week. T-Mobile is now up against two class action lawsuits filed by upset customers seeking compensation for the hack, Insider reported.