Cybersecurity firm FireEye (FEYE) - Get Report said on Monday that one of its Israeli-based researchers had several of his online accounts hacked by unknown assailants, but noted that the breach did not seem to impact any company systems.

Shares of the company were sinking over 3.6% during late morning trading on Monday.

Hackers distributed a zip file containing about 370 megabytes of jeopardized personal and professional data related to a cyber security researcher working for FireEye's cyber forensic consulting unit, Mandiant.

A FireEye spokesman confirmed data had been taken from one its employees.

"We are aware of reports that a Mandiant employee's social media accounts were compromised. We immediately began investigating this situation, and took steps to limit further exposure," a FireEye spokesman said.

"Our investigation continues, but thus far we have found no evidence FireEye or Mandiant systems were compromised."

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