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Dark web sites tied to the Russian-based cyber gang REvil were not operating on Tuesday, just two weeks after the group launched a large-scale ransomware campaign that affected more than 1,500 companies around the world, according to CNBC.

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Why it matters: It's unclear whether the sites — which REvil uses to facilitate its ransom negotiations — are down because of a technical problem, a law enforcement operation, or some other explanation. The group's public spokesperson has also been silent on message boards since last week, according to Politico.