The Tor network is in danger of being swamped by criminals abusing its anonymity to hide an underworld of parasitic botnets, malicious command and control, and "darknet" markets, according to research from Kaspersky Lab.Tor has long had its dark side but the scale of its use by criminals appears to have expanded quite rapidly in the last year. Kaspersky Lab had uncovered evidence of 900 services using Tor, said researcher Sergey Lozhkin, through its 5,500 plus nodes (server relays) and 1,000 exit nodes (servers from which traffic emerges).