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

Static analysis result for SHA-256 bbb47e57037acd2f…

MALICIOUS

Office (OLE) / .XLSX

161.5 KB Created: 2021-05-26 15:25:38 Authoring application: Microsoft Excel
MD5: 5f89c7bf2759e0854661a54f904841d2 SHA-1: 18687695d90eb68985514acb760fb242bb444550 SHA-256: bbb47e57037acd2f1d74101614c715c4ab9d7f294fa138953bc9823c8e16c7ec
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of an encrypted Excel 4.0 macro sheet (OLE_XLM_ENCRYPTED_MACROSHEET) indicates that the file is intended to run embedded macros. The auto-open heuristic (OLE_XLM_AUTOOPEN) further supports this. Without a document body or script content, the exact payload and delivery mechanism cannot be determined, but the file structure strongly suggests malicious macro execution.

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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