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

Static analysis result for SHA-256 179d4c96f9d5de25…

MALICIOUS

Office (OLE) / .XLSX

72.5 KB Created: 2021-12-16 12:35:27 Authoring application: Microsoft Excel
MD5: 5b4e91e68c448d2069ad8c721720b48a SHA-1: b23450a6c7b29b36c836182b1143dcdc61fed44f SHA-256: 179d4c96f9d5de2519e804fa009691bfc04d24c717c9dcafa68b813d1ef64757
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This type of macro is often used to download and execute further malicious payloads. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) further supports this, as it would trigger automatically when the file is opened.

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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