The Black Internet is the segment of the Global Network that has been intentionally hidden. Zombie networks and infected computers have become a big prolem for the advertising industry. The infected computer visits websites without the user's awareness to create false web traffic for personal or commercial gain. In the small period of time, botnets have evolved from small networks of a dozen computers into distributed systems comprising millions of computers with decentralized control.

Click fraud PPC (Pay-Per-Click) advertising is one of the main sources of income for botnets. With a such zombie network, a intruder can generate thousands of unique clicks a day – one from each IP to avoid raising Google’s suspicion. Black internet computers do a great damage to the owners of websites. According to Association of National Advertisers, up to 17% of all clicks in the last year were fake, of which a third was generated by botnets.

The dark web have also became a source of malicious traffic. The big number of botnets are starting to use TOR-based communications. The TOR-based botnets make it really hard to pursue investigation and C&C location tracking. It is important to keep the IP blacklist up to date to protect your site from any malicious activity. It's also important to know from which countries the clicks are coming from. Here is the map of density of suspicious IP addresses per country: