A hacker extracted customer log-in credentials from a server owned by Bitdefender that hosted the cloud-based management dashboards for its small and medium-size business clients.

The antivirus company confirmed the security breach but said in an emailed statement that the attack affected less than 1 percent of its SMB customers, whose passwords have since been reset. Consumer and enterprise customers were not affected, the company said.

The hacker, who uses the online alias DetoxRansome, first bragged about the breach on Twitter Saturday and later messaged Bitdefender threatening to release the company’s “customer base” unless he was paid $15,000.

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