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

Static analysis result for SHA-256 251d30973e7859b1…

MALICIOUS

Office (OOXML) / .XLSM

20.0 KB Created: 2021-03-17 08:20:59 UTC Authoring application: Microsoft Excel 16.0300
MD5: 4582a6687cd04125aa1cd3d47a945962 SHA-1: 5193478f8eb809cc2c1d0b9d9ab77910051fd8d4 SHA-256: 251d30973e7859b193cc753bfad7adcd3e1ae09952ea7af4896ca6d11d0a9fcf
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The file is an XLSM document containing Excel 4.0 macros, specifically triggered by an Auto_Open defined name. The document body text is designed to lure the user into enabling macros by claiming the content is protected. While no external URLs or specific malicious scripts were extracted, the presence of Excel 4.0 macros and the social engineering employed in the document body strongly suggest a malicious intent, likely to download and execute a secondary 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
37488e5434342724e1642807c9ddafaa708f5ebd61b75ac8304dacffeadae7df		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 15844 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.