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

Static analysis result for SHA-256 bc3b0df0a90971d8…

MALICIOUS

Office (OLE) / .XLSX

408.5 KB Created: 2020-11-18 22:00:31 Authoring application: Microsoft Excel
MD5: 66de86a7d9ba80c175fe166a81d25c4d SHA-1: 8c0dcef8ad7aeb1e77bc8a18f19d270af61c94e3 SHA-256: bc3b0df0a90971d83f87af531671216d238ce21b6272aa2758b178cbb1320276
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic further suggests that malicious code is intended to run automatically when the spreadsheet is opened. The document body is unreadable due to encryption, preventing a more detailed analysis of the specific lure or payload.

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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