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Russian hackers behind fresh US cyberattack: Microsoft

The state-backed Russian hacking group that carried out last year's massive SolarWinds cyberattacks is behind a new and ongoing assault against US and European targets, Microsoft said Monday.

The software giant's Threat Intelligence Center (MSTIC) said in a blog post that the Nobelium group was attempting to gain access to customers of cloud computing services and other IT service providers to infiltrate "the governments, think tanks, and other companies they serve". 

Describing the cyberattack as "nation-state activity", MSTIC said it "shares the hallmarks" of the assault on SolarWinds, a Texas-based software company targeted as its 300,000-strong customer base gave the hackers access to a huge number of companies. 

Washington imposed sanctions in April and expelled Russian diplomats in retaliation for Moscow's alleged involvement in the SolarWinds attack, as well as election interference and other hostile activity.

The latest attack has been underway since at least May, MSTIC said, with Nobelium deploying a "diverse and dynamic toolkit that includes sophisticated malware".

Crucial links in supply chain

"Nobelium has been attempting to replicate the approach it has used in past attacks by targeting organizations integral to the global IT supply chain," Microsoft vice president Tom Burt wrote in a blog post published late Sunday.

This time, Burt noted, Nobelium is targeting "resellers" -- companies that customize Microsoft's cloud computing services for use by businesses and other organisations.

"Since May, we have notified more than 140 resellers and technology service providers that have been targeted by Nobelium," he wrote.

"We continue to investigate, but to date we believe as many as 14 of these resellers and service providers have been compromised."

Microsoft said it had notified known victims of the latest attack. While it did not specify any of the organizations hit, it noted they included "victims of interest for intelligence gain".

The software company urged its customers to check on their security arrangements, using multi-factor authentification where possible.

It is not the first time Nobelium has mounted a comeback since SolarWinds, with Microsoft announcing in May that it had again detected a series of attacks by the group on government agencies, think tanks, consultants and other organizations.

Burt said the speed of the attacks was escalating, with Microsoft notifying more than 600 customers this year of nearly 23,000 attempted intrusions.

While the success rate was only "in the low single digits", this compares to "attacks from all nation-state actors 20,500 times over the past three years".

The past year has seen a number of high-profile cyberattacks with major consequences as companies increasingly find themselves unable to do business when their online infrastructure is compromised.

Topics: SolarWinds cyberattacks , Russia , United States , Mircrosoft , Threat Intelligence Center
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