Ciaran Martin, head of the NCSC, said Russian Federation was: "our most capable hostile adversary in cyber-space, so dealing with their attacks is a major priority for the National Cyber Security Centre and our United States allies".
The hackers are using compromised routers to conduct man-in-the-middle attacks to support cyber espionage, steal intellectual property and maintain persistent access in victim networks for use in additional campaigns.
This could be used be used to mount a future offensive, it warned.
"Russia is our most capable hostile adversary in cyberspace so dealing with their attacks is a major priority for the National Cyber Security Centre and our United States allies", he said.
First, this type of effort has targeted millions of machines to spy on ISP customers, organizations and government agencies. The attack strategy let Russian Federation peer at the data passing through the compromised devices, whether that be business or intelligence-related. Third, this allows attackers to cripple firewalls and intrusion detection systems that organizations use to glam malicious traffic, according to the BBC.
White House cybersecurity coordinator Rob Joyce said the United States and its allies had "high confidence" that Russian Federation was behind the campaign.
The joint warning stated stated that the main targets have been ISPs, firms running 'critical infrastructure, ' government departments and big companies.
Ciaran Martin, head of the UK's NCSC, said the issuing of the alert marked a "significant moment" as the two powers had never before given joint advice on how to deal with attacks.
According to Martin, numerous techniques used by Russian Federation, "exploit basic weaknesses in network systems".
And it contained detailed information about attack methods, the signs left when hardware has been compromised, and how networks change when they have been breached. Further intelligence about the attacks had been added by "multiple" cyber-security organisations and companies, he added.
"The UK government will continue to work with the USA, other worldwide allies and industry partners to expose Russia's unacceptable cyber behaviour, so they are held accountable for their actions", Martin added.