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UnclassifiedUnknownAdvanced sophistication

STAC5777

STAC5777 is a threat actor group, tracked by Brandefense.

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Techniques
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Exploited CVEs
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Record updated

About STAC5777.

A threat actor attributed to a sophisticated ransomware campaign exploiting Microsoft Teams for initial access and system compromise.

Last updated Jul 24, 2026. Compiled by Brandefense technologies from structured threat intelligence and reviewed by Brandefense analysts. Techniques follow the MITRE ATT&CK framework.