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

Static analysis result for SHA-256 3e3cd24a1284c9fa…

MALICIOUS

Office (OOXML) / .XLSM

23.3 KB Created: 2021-03-29 15:20:56 UTC Authoring application: Microsoft Excel 16.0300
MD5: a93a2b9474c0aa56f3f41ea181c34617 SHA-1: 30426931c69814fdcb8d7a9515a5faa13a747771 SHA-256: 3e3cd24a1284c9fa0785c272246d20126f571aeaf4ebb328b8ab8207da8e50ad
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The sample is an XLSM file containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLM_AUTOOPEN_DEFINEDNAME heuristics. The document body contains text prompting the user to 'enable editing and content mode', a common social engineering tactic to bypass macro security. While no specific malicious URLs or scripts were extracted, the presence of Auto_Open and the nature of the document body strongly suggest a macro-based attack designed to execute further malicious code upon user interaction.

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
80618dcca31538af233fd1c96cf924466a6552aebce024bf0172561d7d1f6e54		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 28209 bytes

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