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Microsoft assessed with medium confidence that North Korean threat actor Citrine Sleet exploited the Chromium zero-day CVE-2024-7971 on August 19, 2024, to achieve remote code execution while targeting the cryptocurrency sector for financial gain. CERT-EU reported that the flaw was fixed on August 21. The available incident summary does not identify a victim or establish that funds were stolen.
What happened in the 2024 Chrome zero-day incident?
In its September 2024 cyber brief, CERT-EU summarized Microsoft’s assessment that Citrine Sleet exploited CVE-2024-7971, a zero-day vulnerability in Chromium, on August 19, 2024. Microsoft said the flaw was exploited for remote code execution. Microsoft disclosed the activity on August 30, according to CERT-EU.
Microsoft attributed the operation to Citrine Sleet with medium confidence. That is an assessment, not a definitive identification of the attacker.
What was targeted, and what is not confirmed?
Microsoft assessed that the activity targeted the cryptocurrency sector for financial gain. The incident summary does not name a victim, describe a specific cryptocurrency theft, or provide a loss amount or victim count. It also does not establish the attack’s delivery method, detailed exploit chain, or the final disposition of any funds.
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When was the flaw fixed?
CERT-EU says CVE-2024-7971 was fixed on August 21, 2024, two days after the reported exploitation date. These dates describe the historical incident; they are not a current Chrome version recommendation.
What should Chrome users do now?
Check Chrome’s update status and install any update it offers. In Chrome, open More (the three-dot menu) > Help > About Google Chrome. Chrome checks for updates on that page; if an update is available, follow the prompt to install it and relaunch the browser. Because the reported fix dates to 2024, use Chrome’s current update status rather than relying on an old version number.
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How this differs from later cryptocurrency-sector activity
Google Cloud and Mandiant reported a separate campaign attributed to UNC1069 in February 2026. That report describes social engineering, malware, and browser-data collection associated with a different operation. It is not evidence about Citrine Sleet’s 2024 exploitation of CVE-2024-7971; the actors, dates, and reported activity should not be conflated.
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Sources
- CERT-EU, Cyber Brief (September 2024), page 8
- Google Cloud / Mandiant, UNC1069 Targets Cryptocurrency Sector with New Tooling and AI-Enabled Social Engineering, February 9, 2026
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