Underground markets offer a variety of services for cyber criminals to profit from. The underground is filled with a heavy amount of jargon and slang that may be unfamiliar. “FUD” may mean “fear, uncertainty, and doubt” in the normal security world, in the underground forum world it means “Fully UnDetectable” The underground marketplaces offer items such as spam/phishing delivery, zero-day exploits, custom malware development, “Crypters”, “Binders” and bulletproof hosting.”]