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

Static analysis result for SHA-256 3a28c26fbb1e89ff…

MALICIOUS

Office (OOXML) / .XLSM

22.0 KB Created: 2021-04-14 12:23:19 UTC Authoring application: Microsoft Excel 16.0300
MD5: 00fb503aa82eb94e6d14b96bea1bf5b2 SHA-1: 4d8d834a10e9836e6c45d37821dce77884b3ad4a SHA-256: 3a28c26fbb1e89ff548e48cfc5531339f71970c0df08b63ed014049e602ef3ea
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

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 contains text instructing the user to 'Enable Editing' and 'Enable Content', a common lure for macro-based attacks. The embedded Excel 4.0 macros are likely responsible for executing the malicious payload 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
46606a6d5d67e199e899a77d0930f2251924548eba871cc3903a2bbfa3eda34a		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 17242 bytes

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