Malicious Office (OOXML) / .XLSM — malware analysis report

Static analysis result for SHA-256 7eeff0aa9ebb4647…

MALICIOUS

Office (OOXML) / .XLSM

20.2 KB Created: 2021-04-20 12:12:36 UTC Authoring application: Microsoft Excel 16.0300
MD5: 261a6637f9824e0d8467adf325ad1d2a SHA-1: 787c951f8221350221270879629971f99ee6a7d5 SHA-256: 7eeff0aa9ebb46472409c3bd0bcbaef8e7752f6f711f516212f616ce9cb0f701
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an XLSM document containing Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' and 'OOXML_XLM_AUTOOPEN_DEFINEDNAME' heuristics. The presence of an 'Auto_Open' macro suggests that the malicious code executes automatically upon opening the document. While no specific URLs or further script content were extracted, the structure strongly implies a downloader or initial execution vector. The confidence is high due to the critical heuristic firings, but the lack of explicit payload URLs prevents a higher score.

Heuristics 3

  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks.
  • Excel 4.0 Auto_Open defined name critical OOXML_XLM_AUTOOPEN_DEFINEDNAME
    Workbook defines _xlnm.Auto_Open or _xlnm.Auto_Close while containing an XLM macro sheet. This is the OOXML/XLSB auto-execution shape for Excel 4.0 macros.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.microsoft.com/office/excel/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision6

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
53f366d14659c7deb33493ad433e97dde30227b4199a679deff0be23f416ab7f		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 13214 bytes

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