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

Static analysis result for SHA-256 cf7c7c2a4426cdb3…

MALICIOUS

Office (OLE) / .XLS

75.5 KB Created: 2020-12-15 12:07:20 Authoring application: Microsoft Excel
MD5: 0a59b4539de337598e247f34c841cd6d SHA-1: e80b8c526ac63908389263dbfe7affe5e98e1c6b SHA-256: cf7c7c2a4426cdb3ca84fcf5cf31418ed924d5f960b49055c4a084537a4123bc
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 suggests that the macros are designed to run automatically when the document is opened. The lack of readable document body text or extracted scripts prevents a more detailed analysis of the payload or specific attack vector.

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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