Cybercrime-as-a-service (CaaS) and other tools of the trade are available in a growing Dark Web marketplace that caters to attackers. Like traditional criminal underworlds, the Dark Web has its own shadowy networks, its own culture of occasional trust and pervasive suspicion. Some terms draw from the language of physical security, but with altered meanings, such as FUD, which to security specialists represents the fear, uncertainty and doubt that cybercriminals seek to spread, means fully undetectable”]
Source: https://securityintelligence.com/the-dark-web-marketplace-a-shopping-center-for-attackers/