The Russian hackers behind the massive SolarWinds cyberespionage campaign broke into the email accounts of some of the most prominent federal prosecutors' offices around the country last year, the Justice Department said Friday.

US Justice Department: Federal prosecutors also targeted by Russian SolarWinds cyber espionage

The SolarWinds supply chain attack took place after Russian hackers broke into SolarWinds' backend infrastructure and added malware (named Sunburst/Solorigate) to SolarWinds Orion update packages.

What led to the worst cyber attack in the U.S.

The analysis comes as the list of US agencies, private companies and other entities affected by the hacking campaign continues to increase.

A few days after the US alleged Russia of hacking into its systems of government departments, Russia's President Vladimir Putin has patted the back of the country's intelligence service.

Russian President Vladimir Putin appreciates spy agency after US hack controversy

As US officials investigate the hacking of various government departments, President Donald Trump said: "everything is well under control". Watch: The cyber hack is far greater in the fake news media than in actuality.

Cyber hack 'under control', says Trump; plays down Russia's reported role

As US secretary of state Mike Pompeo blamed Russia for the hacking of key US departments, the Department of Homeland Security said that the espionage activity detected was not limited to just SolarWinds software.

Russia link? As Trump remains mum on cyber attack, US authorities scamper to investigate

The United States government has suffered a major hack last night in which 12 federal agencies and 18,000 users have been compromised. However, the breach is far more serious than what many had imagined as the US nuclear weapons agency was hacked too.

Hackers breach US government departments; world questions US' cybersecurity

Microsoft Corp said on Thursday it found malicious software in its systems related to a massive hacking campaign disclosed by U.S. officials this week, adding a top technology target to a growing list of attacked government agencies.

Microsoft says it found malicious software in its systems

McDonald's blamed the tweet on a hack by an 'external source'

McDonald's apologises after tweet calling Trump 'disgusting excuse of a president'

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US Justice Department: Federal prosecutors also targeted by Russian SolarWinds cyber espionage

What led to the worst cyber attack in the U.S.

What led to the worst cyber attack in the U.S.

Russian President Vladimir Putin appreciates spy agency after US hack controversy

Cyber hack 'under control', says Trump; plays down Russia's reported role

Russia link? As Trump remains mum on cyber attack, US authorities scamper to investigate

Hackers breach US government departments; world questions US' cybersecurity

Microsoft says it found malicious software in its systems

McDonald's apologises after tweet calling Trump 'disgusting excuse of a president'