Organized cyber crime gangs siphon about 400 million a year from U.S. businesses, according to a McAfee Institute study. But new, inexpensive and easy-to-use software has made hacking so easy, even a grandmother could do it.

As businesses prepare for large-scale hacks, relatively inexperienced hackers looking for a quick buck are sneaking in using widely available software, according to an article by Ondrej Krehel, founder of LIFARS. Most companies don’t understand the dangers and are hardly prepared to defend against such unsophisticated attacks.

Additionally, the number of websites offering hacking services and posting employment opportunities for hackers continues to grow.

Just how dangerous are these amateur hackers? LIFARS presents a case study outlining how one large company lost more than $5 million a year before LIFARS implemented remediation and prevention solutions.