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Ukraine Alerts to CABINETRAT Backdoor Delivered via XLLs

⚠ The Computer Emergency Response Team of Ukraine (CERT‑UA) warns of targeted attacks using a new backdoor dubbed CABINETRAT distributed via malicious Excel add-ins (XLL) concealed inside ZIP archives shared over Signal. The XLL implants an EXE in Startup, places BasicExcelMath.xll in the Excel XLSTART folder and drops a PNG that hides shellcode. It employs registry persistence and robust anti-VM checks, and the C-based backdoor performs reconnaissance, remote command execution, file operations and data exfiltration over TCP.