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

Static analysis result for SHA-256 fc385914e030cdc9…

MALICIOUS

Office (OOXML) / .XLSM

22.2 KB Created: 2021-04-12 18:41:19 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0bf11ac4cf33ce34e45622e6b2b1b7d6 SHA-1: 1afb8d85937d0f5f8fc6e3f1cdb6f39405826360 SHA-256: fc385914e030cdc9b178d9c5be1142dcdb58de0eb54b8f2e17323bfad193c1f5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The sample is an XLSM file containing Excel 4.0 macros, specifically triggered by an Auto_Open defined name. The document body contains text instructing the user to 'Enable Editing' and 'Enable Content', a common lure for macro-enabled malicious documents. The presence of Excel 4.0 macros suggests an attempt to download and execute a second-stage 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
680509cbb2d2aeac6141ada95577e2a9df6493a3be803e30f26d277fcb315091		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 17244 bytes

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