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GroupM, the world’s largest media-buying network, fended off a cyberattack last week, according to three sources who spoke to Adweek on condition of anonymity.
Agents from the Federal Bureau of Investigation’s New York field office visited the WPP organization’s headquarters at 3 World Trade Center to investigate the attack, according to one party with direct knowledge of the matter.
WPP declined to confirm or deny the incident.
“Like all major companies we are constantly subject to attempts to circumvent our controls and protections,” said a spokesperson.
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