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

Static analysis result for SHA-256 8224ff58f057e986…

MALICIOUS

Office (OOXML) / .XLSM

22.2 KB Created: 2021-04-14 11:10:31 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5bf11adcc496d98bfa31b4c63220ba95 SHA-1: a767b189c7805739741185cfbd0d9af727d162db SHA-256: 8224ff58f057e986f3d319513f4259cd89ee9035eb9fd03839258f4ce183906b
122 Risk Score

Malware Insights

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

This XLSM file contains Excel 4.0 macros, indicated by the 'OOXML_XLM_MACROSHEET' and 'OOXML_XLM_AUTOOPEN_DEFINEDNAME' heuristics. The document body prompts the user to enable editing and content, a common lure for macro-enabled malicious documents. The presence of Excel 4.0 macros suggests an attempt to execute arbitrary code upon opening, likely for further payload delivery.

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
0d7271b93436eb3381d0bfac3cd700120d2c76a059b25491e8675318380b8a7b		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 17587 bytes

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