Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6bffaa08a8be3fd4…

MALICIOUS

Office (OLE)

99.0 KB Created: 2020-04-21 13:56:55 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 33630da1f7f6b326126fe1684eefd8ad SHA-1: 5e8fc1e2c6262991bab633408e3ba6bcd2d877ca SHA-256: 6bffaa08a8be3fd4126d18c8a2838d9f1c26eb531ab4396b94aa0225ea5d85c8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by multiple heuristic firings including OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN. The presence of encrypted macros strongly suggests the file is intended to execute malicious code, likely for initial access or payload delivery.

Heuristics 3

  • OLE metadata lists many Excel 4.0 macro sheets high 2 related findings OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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