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

Static analysis result for SHA-256 0e7faf90a4ffc24f…

MALICIOUS

Office (OLE) / .XLSX

98.0 KB Created: 2021-08-26 06:04:04 Authoring application: Microsoft Excel
MD5: 2b3872dc7cb6fdfe00f6639130b80691 SHA-1: 61de41881e270cc56a36c8b4b3e28e0f04f4856f SHA-256: 0e7faf90a4ffc24f38e6fc171b9a5faa7b285fde26a77e8bcac1366ecc22a827
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macros, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN' heuristic firings. This suggests the file is intended to automatically execute malicious code when opened, likely to download and run a secondary payload. No specific family could be identified.

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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