Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 3663f0b8534a90d0…

MALICIOUS

Office (OLE) / .XLS

208.0 KB Created: 2020-10-01 02:52:46 Authoring application: Microsoft Excel
MD5: 472ace8642e87994658ff5912d12cbce SHA-1: 285fb722cfe26ebe2dc267b04826415dd5d20fed SHA-256: 3663f0b8534a90d0d1a363a5c810d285d03e33af52b431650348ba22a80c9190
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to run automatically when the document is opened. No specific IOCs were extracted due to the encrypted nature of the macro.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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