• Also known as Cold River, Seaborgium, TA446, TAG-53
Calisto is a Russian government-affiliated threat actor. The group uses spear-phishing tactics to compromise individual email accounts for espionage purposes. The group has also been known to leak stolen emails as part of information-warfare efforts.
Suspected victims
  • Politicians and organizations in the United States, United Kingdom, and Europe.
Suspected state sponsor
  • Russian Federation
Type of incident
  • Espionage
Target category
  • Private sector
  • Civil society
  • Government