Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e71bff316a0041a9…

MALICIOUS

Office (OLE)

93.5 KB Created: 2020-04-01 11:48:22 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 5c3b7465c5f84d12684b46f3436a0835 SHA-1: 2e10cd6d2121752c2f27df1e4e48cc330c97d7a7 SHA-256: e71bff316a0041a90a68b3d5adcc23e8efc2b5b7432602b2d649e30cadc20fec
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is identified as an encrypted Excel 4.0 macro sheet, indicated by multiple heuristic firings including OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN. The presence of encrypted macros suggests an attempt to hide malicious functionality, likely for execution via Excel's macro capabilities. No specific IOCs were extracted, but the file structure strongly points to malicious macro execution.

Heuristics 3

  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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