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

Static analysis result for SHA-256 728ee1bba536ba44…

MALICIOUS

Office (OOXML) / .XLSM

20.1 KB Created: 2021-03-24 10:34:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4d67a087b1895d74153d5e022e7b9df7 SHA-1: 379dae83354cb8600b8693abc7cb310431fb8e7f SHA-256: 728ee1bba536ba44d49e0fd38e8910335260a4c56897f7ce4426e5c1e834c062
122 Risk Score

Malware Insights

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

The sample is an XLSM file containing Excel 4.0 macros, specifically an Auto_Open macro, which is a strong indicator of malicious intent. The document body's text is designed to prompt the user to enable editing and content, a common social engineering tactic to bypass security measures. The presence of Excel 4.0 macros suggests the potential for executing arbitrary code or downloading further payloads.

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
896c26ae16425f729dc7a055540d1e84d2501dc7020ee7d3faedbe20de1fdc73		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 15976 bytes

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