Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 618feda769632fad…

MALICIOUS

Office (OLE)

374.0 KB Created: 2020-04-01 21:39:42 Authoring application: Microsoft Excel First seen: 2020-08-25
MD5: 610ad5a9d4137f0d0f316dfe6aa648ed SHA-1: 23fa7f0dea9cc43a7006c448c9a065f7b5494c35 SHA-256: 618feda769632fad7e77dd0c8ee8674f403a34488c5b4274294d2a8e5fb12849
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macro sheets, indicated by multiple high-severity heuristic firings including OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN. The presence of these encrypted macros strongly suggests the file is intended to execute malicious code, likely as a downloader or initial stage for a more complex attack. No specific family could be identified due to the encryption and lack of further script content.

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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