Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 028bbab37adb09e2…

MALICIOUS

Office (OLE)

245.5 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: bf43e783b12e3dd05f3dcefbffcc8802 SHA-1: 08005ea16e115c9dc034c93c41631e2f71420a5b SHA-256: 028bbab37adb09e219c65441bb2fe342d1bae785a3e0a11d5284ed44588fcf86
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, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to run malicious macros. The presence of an AUTOOPEN macro further supports this, as it would execute automatically when the workbook is opened. No specific IOCs were extracted due to the encrypted nature of the macros.

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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