Kapustkiy wo n't buy malware , but the hacker claims to sell zero day exploits , software loopholes that allow attackers to exploit software and networks . `` I ca n't name the site I use , but I think that most hackers would use the same [ sites ] , '' he said . Kapustkiy is a young , ideologically driven hacker who frequently tunnels into government and corporate sites . `` I hack for political reasons , '' he said in translated , broken English , `` but make money sometimes from selling hacks . '' Zero day exploits are a major profit center for many hackers and are at the heart of underground cyberwar ecosystem . Malware and software bugs can sell for tens or hundreds of thousands of dollars on the Dark Web . SEE : IT leader 's guide to the blockchain ( Tech Pro Research ) Zero day bugs are valuable because of the high stakes for victims . Bugs in Flash or Windows grant hackers easy access to corporate systems . Malware in the form of Stuxnet was allegedly developed and deployed by the United States and Israel to attack Iran 's nuclear program , and Sandworm was allegedly used by Russian hackers to attack NATO . I got a huge list of around 20 domains and I saw that Vulnerability-related.DiscoverVulnerability all of them were running on the same server and also had Vulnerability-related.DiscoverVulnerability the same vulnerability . So I found Vulnerability-related.DiscoverVulnerability a exploit in the web-server and I managed to hack [ several sites ] .