Microsoft and Japan Disrupt Network Behind 1 Billion Scam Messages

Microsoft and Health-ISAC seized and redirected domains supporting three phishing services that enabled more than 1 billion emails and text messages since January 2026, disrupting a network that targeted organizations and people worldwide. The domain action covered YAM Store, CoGUI and Iron Man and took place under an order from the U.S. District Court for the Southern District of Florida. Microsoft disabled more than 20,000 accounts connected to YAM Store and is blocking more than 100,000 domains used for impersonation and fraud. The campaigns targeted more than 75,000 organizations.

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