BOSTON- Hackers who infiltrated the Nasdaq's computer systems installed malicious software on the exchange's computers that allowed them to spy on scores of directors of publicly held companies, according to two people familiar with an investigation into the matter.
The US exchange operator disclosed in February that it was investigating a breach into its network.
Nasdaq OMX Group identified that its systems were hacked last year, and removed malicious software from its servers in October. That sparked an investigation involving the FBI and National Security Agency that is ongoing.
Trading platforms were not compromised, the exchange said when it disclosed the attack in February, although an Internet-based software program was attacked.