Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b485eb91b7916224…

MALICIOUS

Office (OLE)

347.5 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 2f058d4079fbb803bd19ec3472782bff SHA-1: 18782bfc2d12d48620a6e6c16dee135752c53dc8 SHA-256: b485eb91b7916224375339732eb346a172b8c598001985a5ccdac517d0b7f1d2
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This strongly suggests the file is designed to execute malicious macros when opened. The specific nature of the macro's execution is unclear due to encryption, but the presence of XLM macros points to the Visual Basic technique.

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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