The Russian attacks have affected a wide range of organisations, including internet service providers, private-sector firms and critical infrastructure providers, the officials said.
Russian Federation has hacked into millions of computers across Britain, including home terminals and internet routers, and may be preparing for a widescale cyber attack, United States and UK security chiefs said in an unprecedented warning last night.
The statement (via Forbes) says Russian Federation is carrying out the operations "to support espionage, extract intellectual property, maintain persistent access to victim networks and potentially lay a foundation for future offensive operations".
Specifically, these cyber exploits are directed at network infrastructure devices worldwide such as routers, switches, firewalls, and the Network Intrusion Detection System (NIDS).
The imminent attack was not, however, linked to allied nations' missile strikes on Saturday in Syria, Britain's Press Association (PA) news agency reported, citing White House cybersecurity coordinator Rob Joyce.
The joint TA is the result of analytic efforts between the US Department of Homeland Security (DHS), the Federal Bureau of Investigation (FBI), and the UK's National Cyber Security Centre, according to information on the official website of the DHS.
FBI Deputy Assistant Director Howard Marshall said the activity is a part of a "repeated pattern of disruptive and harmful cyber action" carried out by Russian Federation.
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Russian Federation gets ready for large-scale cyber attacks.
"They could be pre-positioning for use in times of tension", said Ciaran Martin, chief executive of the British government's National Cyber Security Centre cyber defense agency, who added that "millions of machines" were targeted.
Australia later joined forces with the United Kingdom and USA, saying 400 of their companies had also been caught up in Russian state-sponsored attacks that were identified in August.
"This is a global threat", Manfra said. It marks an important step in our fight back against state-sponsored aggression in cyberspace.
U.S. officials said this year that Russian military hackers compromised routers in South Korea in January and deployed new malware when the Olympics began in February.
Ms Manfra said the campaign was widespread and could cover "everything from large enterprises to small home offices".