The Blackhole exploit kit has made a surprising reappearance two years after cybercriminals stopped using it, according to security vendor Malwarebytes.

Exploit kits are frameworks planted on Web pages that try to find software flaws on the computers in order to silently install malware.

Blackhole was one of most popular exploit kits, but it faded from prominence after its alleged creator, who went by the nickname Paunch, was arrested in Russia. The kit was sold or rented to other cybercriminals in the underground economy for hacking tools.

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