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

Static analysis result for SHA-256 64c1b3b18630ec57…

MALICIOUS

Office (OOXML) / .XLSM

19.9 KB Created: 2021-03-17 08:26:05 UTC Authoring application: Microsoft Excel 16.0300
MD5: 3f5e49da287dcc1c0bcafb5ff2147776 SHA-1: 2da793a8ac3476019d9aa09f0dd48958ae94225e SHA-256: 64c1b3b18630ec57066138a28e1d9fe9ae87359b6c377bd9cabd383836b3f0fa
122 Risk Score

Malware Insights

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

The sample is an XLSM file containing Excel 4.0 macros, specifically an Auto_Open defined name, indicating malicious intent. The document body displays a deceptive message prompting the user to 'Enable Editing' and 'Enable Content', a common lure for macro-based attacks. The embedded Excel 4.0 macro sheet is the primary artifact, likely responsible for executing the malicious 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
246ce893ae855c89fb16d6ced5456e7aed50fa029d9b7e4ec15603e6c990ad27		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 15717 bytes

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