A
Defence Ministry spokesman said the ministry would not comment.
El País said the virus was apparently introduced via email and
was first spotted at the beginning of March. However, it could
have gone undetected for months in an intranet with more than
50,000 users.
Although the network does not carry classified information, the
paper said its sources were concerned about a wider infection to
other networks with the purpose of accessing information related
to secret military technology.
The investigation had yet to determine who was responsible for
the cyberattack, but sources told El País it was too technically
complex to be done by standard hackers. "There is a state behind
it," they said.
(Reporting by Jose Elias Rodriguez; Editing by Axel Bugge and
Frances Kerry)
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