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Microsoft warns of surge in ACR Stealer attacks on customers
- Engineer — Learn: ACR Stealer targets browser-stored credentials and tokens — review whether your CI/CD pipelines or developer workstations enforce short-lived tokens and MFA to limit blast radius if credentials are harvested.
- SOC/IR — Act: Microsoft is actively observing this campaign; hunt for ACR Stealer IOCs across EDR telemetry and SIEM, and tune detections for credential-access behaviors (browser credential dumping, token theft) across enterprise endpoints.
- Leader — Plan: A confirmed surge targeting enterprise customers elevates infostealer risk on your risk register; consider briefing on phishing-resistant MFA adoption and reviewing credential hygiene posture this quarter.
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