"This malicious campaign by Russia's military intelligence service presents a serious risk to targeted organisations, including those involved in the delivery of assistance to Ukraine," Paul Chichester, Director of Operations at the UK's National Cyber Security Centre (NCSC), said.
The campaign has also targeted defence, IT services, maritime, airports, ports and air traffic management systems sectors in several members of the NATO military alliance, the NCSC statement said.
GRU Unit 26165 - also known as APT 28 or Fancy Bear - is said to have gained access to some networks using a range of techniques, including guessing log-in credentials and spear-phishing - where specific individuals or organisations are targeted in an effort to gain access to a network.
Wednesday's advisory was issued in conjunction with Australia, the United States, Germany, the Czech Republic, Poland, Canada, Denmark, Estonia, France and the Netherlands, warning organisations of the elevated threat and urging immediate action to protect themselves.
"We strongly encourage organisations to familiarise themselves with the threat and mitigation advice included in the advisory to help defend their networks," Chichester said.
with PA
