The topic of cyberwar has gotten renewed attention amid the Russia-Ukraine war.

A form of cybercrime called "financial sextortion" is rapidly rising in North America and Australia, with a major portion driven by a non-organized cybercriminal group in West Africa who call themselves "Yahoo Boys," according to a new study from the Network Contagion Research Institute (NCRI). 

Sextortion is "a crime that involves adults coercing kids and teens into sending explicit images online," according to the FBI. The criminals threaten their victims with wide distribution of the explicit images, including to the victims' friends and family, unless the victims pay them, repeatedly, through a variety of peer-to-peer payment apps, cryptocurrency transfers and gift cards.