Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5cd489151b7f8e62…

MALICIOUS

Office (OLE)

117.0 KB Created: 2020-04-21 13:56:55 Authoring application: Microsoft Excel First seen: 2020-07-24
MD5: 93dc4401be2015d16ae4c0c6872e7728 SHA-1: 55f60ccc2a9ca8392f36a4e7caba0617ad965b8b SHA-256: 5cd489151b7f8e625361a2462418b0b3ed2672174d3928964b86b7c54fa58614
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The file is an encrypted Excel 4.0 macro sheet, indicated by multiple high-severity heuristics. The presence of 'AUTOOPEN' suggests automatic execution upon opening. While the document body is unreadable, the macro sheet structure strongly implies an attempt to execute arbitrary code, likely as a payload delivery mechanism.

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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