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

Static analysis result for SHA-256 283690aca2479554…

MALICIOUS

Office (OOXML) / .XLSM

24.1 KB Created: 2021-03-29 13:27:03 UTC Authoring application: Microsoft Excel 16.0300
MD5: c46fe253708828f41db239814d556d9c SHA-1: a33cd103e4b562e4350bfb71c5fb20fd3514cad5 SHA-256: 283690aca24795544cc3b83709ba88a84720399b0cca9bca20eb99f5516d04bb
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, specifically triggered by an Auto_Open defined name. The document body contains text that prompts the user to enable editing and content, a common social engineering tactic to bypass security warnings and execute malicious macros. The presence of Excel 4.0 macros suggests an attempt to download and execute a secondary payload, although no specific URLs for this purpose were extracted.

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
d891d0b3ffb2d3649f8be04c74eeb6c043d280f7ce2b0ef2f5fa16141e088bd4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 31264 bytes

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