Malwarebytes said its intrusion is not related to the SolarWinds supply chain incident since the company doesn't use any of SolarWinds software in its internal network.
Instead, the security firm said the hackers breached its internal systems by exploiting a dormant email protection product within its Office 365 tenant.
Malwarebytes said it learned of the intrusion from the Microsoft Security Response Center (MSRC) on December 15, which detected suspicious activity coming from the dormant Office 365 security app.
At the time, Microsoft was auditing its Office 365 and Azure infrastructures for signs of malicious apps created by the SolarWinds hackers, also known in cyber-security circles as UNC2452 or Dark Halo.
Malwarebytes said that once it learned of the breach, it began an internal investigation to determine what hackers accessed.
"After an extensive investigation, we determined the attacker only gained access to a limited subset of internal company emails," said today Marcin Kleczynski, Malwarebytes co-founder and current CEO.
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