“What makes it dangerous is what it does once they’re in: it turns an ordinary low-privilege account into full system control by abusing Defender itself, the security tool running at the highest privilege on the box,” he said. “An exploit that lives inside your antivirus is quiet, it’s trusted, and it can be used to blind or disable the very thing you’re counting on to catch the intruder. It’s not a worm, but it’s a near-ideal second stage for ransomware crews and anyone doing hands-on-keyboard intrusion.”
Levine suggested that CISOs not wait for a Microsoft fix, but immediately take an aggressive defensive stance.
“Assume it’s live and lean on defense in depth, because this is exactly the scenario where treating Defender as your only line fails you. Application allowlisting, such as WDAC or AppLocker in enforced mode, is the strongest hardening available and can stop the payload even if the race succeeds,” Levine said.
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