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

Static analysis result for SHA-256 5194873f8a893261…

MALICIOUS

Office (OLE) / .XLS

201.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 0bbffdaacf9eca0db2176c4b2585b814 SHA-1: c1cf73e253d3ddd90984349c1f45638ceafaa63b SHA-256: 5194873f8a8932619732b1adc041b83a4c7186ddf913ba3563d01ed8d3ef538a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-execute macro. While no specific payload or URL was extracted, the encrypted nature and auto-execution strongly suggest a malicious intent to download and execute a secondary 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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