The notorious Russian Business Network has suddenly picked up from its St. Petersburg digs and diversified, spreading its unwholesome activity to new chunks of IP addresses, with RBN-like activity almost immediately appearing on newly registered blocks of Chinese and Taiwanese IP addresses, according to security company Trend Micro.

The Internet presence for the RBN—a Russian ISP that's infamous for hosting shady and criminal businesses—blinked off at about 7 p.m. PST on Nov. 6, security researchers at Trend Micro reported the following day. The RBN's IP addresses can no longer be reached, since the routing for them no longer exists as of Nov. 8. In a posting, Trend Micro's Feike Hacquebord conjectured that the RBN's upstream providers may have yanked Internet connectivity services temporarily or even permanently.

Trend Micro has noticed RBN-like activity on blocks of IP addresses that were registered in China and other locations shortly before the RBN closed down the routes to its St. Petersburg addresses.

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