Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c0381b65a0979615…

MALICIOUS

Office (OLE)

106.0 KB Created: 2020-04-21 13:56:55 Authoring application: Microsoft Excel First seen: 2020-09-24
MD5: c10db36f5a07bd13703226344b43cc1c SHA-1: e67cf3ac54881bb4791e903426c3161e50249339 SHA-256: c0381b65a09796156de7dfc69e48cd0d16d67a27ced3fd15bc0c86c8d0f97b75
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 heuristic firings. The presence of an 'AUTOOPEN' macro suggests it attempts to execute automatically upon opening. While the document body is unreadable, the macro sheet structure points to a malicious Excel document, likely delivered as a spearphishing attachment.

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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