Ukraine’s national cyber incident response team, CERT-UA, has issued an urgent warning about a new malware campaign that weaponizes Excel add-in (XLL) files to deploy the CABINETRAT backdoor. Throughout September 2025, CERT-UA analysts discovered multiple malicious XLL files masquerading as benign documents, including “Звернення УБД.xll” and “recept_ruslana_nekitenko.xll,” which exploit Excel’s Add-in Manager and the xlAutoOpen […]
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