The same hacker behind the SolarWinds attack was able to place data-stealing software on customer service representatives' computers, the company said.
Microsoft said Friday that hackers breached a computer used by SLOT one of its customer service representatives and stole the account information they used to launch the attack. The company identified hackers as Nobelium, the same group behind last year's massive SolarWinds breach.
Microsoft has secured computers in which hackers infect software, steal data and notify "a small number" of affected customers, it said in a post Friday on its Security Response Center site.
The company has sent a warning to affected Microsoft Services members. It said hackers had access to the data in the second half of May, Reuters reported on Friday. The stolen information includes contact information for billing and services paid by customers.
The news outlet said Hackers can use that basic information in fake emails and fake phone calls. as part of a phishing attack This will allow them to access more sensitive information.