Such tools provide shortcuts for cybercriminals seeking to infect computers to steal financial data or passwords, commit identity theft, or spam PC users with bogus sales offers, for instance.
While observers suggest Russia is the source of many mercenary hackers, arrests are extremely scarce and prosecutions even more rare.
The Internet security community has been abuzz ever since over indications that the arrest of Paunch and partners led to an immediate dropoff in activities normally connected with the group.
Paunch has not been publicly identified by name, and Russian authorities have remained relatively silent over the arrest. Russian media, including RT, have confirmed the arrest. Reuters quoted a "former Russian police detective in contact with Russia's federal government" in reporting the news.
Paunch is believed to be behind "Blackhole" and "Cool," coded tools designed to help "automate cybercrime" by providing cybercriminals with "not only the tools for criminals to create and distribute malware, but also the systems used to manage networks of infected machines," according to leading cybersecurity provider Sophos.
The online sale of such exploit kits can reap many millions of dollars in sales for their creators.
Hints that Russian law enforcement was on the right track include decreased use of the "Blackhole" and "Cool" programs, the former of which was suspected of aiding at least one in four web attacks just two years ago.
The head of Europol's new European Cybercrime Centre (EC3), Troels Oerting, reportedly confirmed the arrest after a full day of intense speculation.
Oerting subsequently retweeted Finnish cybersecurity specialist Timo Hirvonen's illustration of the immediate effect that the arrest appeared to have. The graphs show a dramatic drop in "hits" employing "Blackhole" and "Cool."
Why the arrest of 'Paunch', the father of Blackhole and Cool exploit kits, is a big deal and makes a real difference: pic.twitter.com/2DwBgcVNqY— Timo Hirvonen (@TimoHirvonen) October 9, 2013
BBC quoted the chief security expert at Moscow-based Internet protection firm Kaspersky Lab, Aleksandr Gostev, as saying "anonymous sources" had confirmed the arrest to him.
Conde Nast Digital's tech news website Ars Technica highlighted both the massive role that Paunch has played in undermining online security and the danger of assuming that his or her arrest will translate into relief for PC users anywhere. It noted that while Blackhole was thought to play a part in nearly a third of Internet attacks in 2011, "Blackhole" and "Cool" "only make up four percent of the market" now.
Online specialist mag Infosecurity underscores the continuing risk, quoting Luis Corrons, technical director at PandaLabs told Infosecurity:
-- Andy Heil