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

Static analysis result for SHA-256 04f5e69b3e35a942…

MALICIOUS

Office (OOXML) / .XLSM

19.9 KB Created: 2021-03-17 06:53:54 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0f4dc716737a4fa41422ae05172f735b SHA-1: 7cea05dc1a2b0e0da0fdfeb5083647546b6fe8f7 SHA-256: 04f5e69b3e35a942cad20882841ed0282f6421d3b3a2e3af5bce99beb0f3d3ef
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

This XLSM file contains Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLM_AUTOOPEN_DEFINEDNAME heuristics. The document body uses a common social engineering tactic to prompt users to "Enable Editing" and "Enable Content". The embedded Excel 4.0 macro sheet, xlm_sheet_00.xml, likely contains the malicious logic, potentially executing commands or downloading further payloads upon enabling content.

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
b2b0e7108157bb51661655d843834df6f30ad52ba47f3f20b6e2916483fa16ee		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 16088 bytes

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