Microsoft did not say what campaign was targeted but said it had informed those targeted.
In a blog post Friday
, Tom Burt, Microsoft’s corporate vice president for customer trust and security, wrote that the targeted accounts also included current and former US government officials, journalists covering global politics and prominent Iranians living outside of Iran.
Four accounts were compromised, Burt said, but they were not associated with the presidential campaign or the current and former US government officials.
President Donald Trump’s re-election campaign said in a statement Friday that it has no indication any of its infrastructure was targeted by the hackers. Communications director Tim Murtaugh declined to say whether any authorities have reached out.
On Tuesday, the Democratic National Committee sent a security alert to 2020 campaigns about the attempt.
“Phosphorus has been attacking personal as well as official work accounts. They create believable spear phishing emails and fake LinkedIn profiles as primary tactics,” Bob Lord, the DNC’s security chief, wrote in the alert obtained by CNN.
The DNC advised campaigns to check their systems for attempted logins from a specific computer network and asked campaigns concerned that they might have been targeted to contact the committee.
Microsoft said that while the attacks were not “technically sophisticated,” the hackers “attempted to use a significant amount of personal information both to identify the accounts belonging to their intended targets and in a few cases to attempt attacks.”