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

Static analysis result for SHA-256 8adb6f54e65e375e…

MALICIOUS

Office (OOXML) / .XLSM

23.7 KB Created: 2021-03-29 13:35:45 UTC Authoring application: Microsoft Excel 16.0300
MD5: ccb137d9d5260eaa14873354292dd85c SHA-1: f15f61a2af9d73c8ea16e88e88f91c3012656be7 SHA-256: 8adb6f54e65e375e16f3cda377df2d2a89f6aac15385fab45354240e7f1a13bc
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment 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 document body text is heavily obfuscated but suggests a social engineering lure to enable content. The presence of Excel 4.0 macros and the lure indicate a likely attempt to download and execute a malicious payload, although no specific URLs or scripts were extracted to confirm this.

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
0c736de3bb3def1d494ec05f7254b61991cb2b2114daa3ec4049a3716a1fc9f3		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 28855 bytes

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