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

Static analysis result for SHA-256 407023a0c6323200…

MALICIOUS

Office (OOXML) / .XLSM

20.2 KB Created: 2021-03-17 06:31:43 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0f74e574034bab14711f13ba5688b1f8 SHA-1: cc76903f82d859fe2c6ed800411a76c0cdc32def SHA-256: 407023a0c6323200a460355053c4b593ab374098a85ef4558f3a6207ee933f86
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter

The file is an XLSM document containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLM_AUTOOPEN_DEFINEDNAME heuristics. The document body contains a lure suggesting the file is encrypted and requires enabling editing and content to view. This strongly suggests a macro-based attack designed to trick the user into executing malicious code. No specific IOCs like URLs or hashes were extracted, and the family could not be determined.

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
a1740fb9bd7c74875aecf09302511c7d593594414e25e7847a8aa1be4244dbd9		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 16600 bytes

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