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The OIG report said the hackers used "a compromised external user system" to access the JPL missions network.
"The attacker exfiltrated approximately 500 megabytes of data from 23 files, 2 of which contained International Traffic in Arms Regulations information related to the Mars Science Laboratory mission," the NASA OIG said.
"Classified as an advanced persistent threat, the attack went undetected for nearly a year," the NASA OIG said. "The investigation into this incident is ongoing."