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

Static analysis result for SHA-256 56d0a1d000f4553c…

MALICIOUS

Office (OOXML) / .XLSM

21.8 KB Created: 2021-04-12 15:46:40 UTC Authoring application: Microsoft Excel 16.0300
MD5: 353d1fd18af7306adf9bcf830c8feb83 SHA-1: b67528872b9e282408649cd5e9a9356a8d8b73e2 SHA-256: 56d0a1d000f4553cdd0a270d0bacaee05633bd2c28bfece6d7476a0e30ade599
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The file is an Excel macro-enabled spreadsheet (XLSM) containing Excel 4.0 macros, specifically triggered by an Auto_Open defined name. The document body text indicates a "protected content" message, a common lure to enable macros. The presence of Excel 4.0 macros suggests an attempt to execute arbitrary code, likely for downloading and executing a second-stage payload.

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
738d417c58c5b054715481a61611f82b2e03dc9cf83509c506870920fb208cb9		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 16367 bytes

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