It cited an unidentified presidential official. The president's office acknowledged the loss of data but couldn't confirm the details.
The Blue House has apologized on its website for allowing names, birth dates and IDs to be stolen. Passwords were not compromised. Several North and South Korean websites shut down on Wednesday, the anniversary of the start of the Korean War.
The Korean Peninsula remains technically at war because the 1950-53 conflict ended in a truce. Seoul blames hacking for last week's shutdown. North Korea hasn't commented.