The Russian Trading System (RTS) was forced to stop trading on its three markets from 4:15 p.m. to 5:20 p.m. Moscow time Thursday after an infected computer connected to the markets' network overwhelmed routers with repeated requests.
"The infected computer started generating huge volumes of parasitic traffic, which overloaded the RTS' support routers. The result was that normal traffic, data going into and out of the trading system, was not processed," said Dmitry Shatsky, vice president of RTS, in the statement.
Although RTS said the attack was caused by an unnamed virus, an analyst from Moscow-based Kaspersky Labs said it was actually a denial-of-service (DoS) attack. "It looks like someone hacked into local machine connected to the network, and from it, launched a denial-of-service attack," said David Emm, senior technology consultant with Kaspersky.
"When they discovered this, they disconnected the machine from the network. There doesn't seem to have been any long-term damage."
Emm said that according to reports he's received from Moscow, no financial data was stolen.