Seqrite, along with its partner seQtree InfoServices, in a statement said it has "tracked an advertisement on DarkNet announcing secret access to the servers and database dump of over 6,000 Indian businesses".
It added that hacker -- who has targetted ISPs, Government and private organisations -- has priced the information at 15 Bitcoins.
It further warned that the hacker is also offering network takedown of the affected organisations for an unspecified amount.
Seqrite, the enterprise security solutions brand of Quick Heal, said the affected organisation has been identified as India's national Internet registry - IRINN (Indian Registry for Internet Names and Numbers) that falls under National Internet Exchange of India (NIXI).
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NIXI, in an emailed response, acknowledged that there had been an attempt to penetrate the system but "no serious security breach" of IRINN system has taken place.
Following this breach, security protocol has been further strengthened and review of existing infrastructure has also been initiated, NIXI said.