According to the country's state run media reports, the government blames the attacks on "hostile forces" including the United States.
The US and the South Korean regime are massively bolstering up cyberforces in a bid to intensify the subversive activities and sabotages against the DPRK, the state-run media said.
According to CNN, North Korea has been under intense international pressure since its third nuclear test earlier this year, which spurred the UN Security Council to approve tough new sanctions.
Pyongyang threatened a possible "pre-emptive nuclear attack" earlier this month, and the official news agency reeled off agreements with South Korea that it said would no longer apply.
Among them are its non-agression pacts with the South, which helped bring the Korean War to a close in 1953, the report said.