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

Static analysis result for SHA-256 46369fbb01b3fecf…

MALICIOUS

Office (OOXML) / .XLSM

86.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300
MD5: e12fa2713baa1f77a6bfc1e6288fdc1b SHA-1: a84b9d7813ab3088edcc631e92cc14e5b55a17d2 SHA-256: 46369fbb01b3fecf792a24cd97158ea14180d4536fae545b29dd910fca38fa01
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Micro Focus Directory Services T1204.002 Malicious Link: Malicious File T1059.001 PowerShell

The file is an Excel 4.0 macro-enabled spreadsheet (XLSM) containing Auto_Open macros. Critical heuristics indicate the use of dangerous XLM functions like EXEC and CALL, which are used to directly call Win32 APIs. The document body and extracted URLs suggest the macro's intent is to download and execute a second-stage payload from the provided URLs. The specific functions used point towards a downloader or initial access mechanism.

Heuristics 4

  • Excel 4.0 macro sheet (2 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.
  • Dangerous XLM formula APIs: WORKBOOK.HIDE, EXEC, CALL, HALT, FORMULA critical OOXML_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet uses formula APIs that call directly into Win32 (=CALL/=EXEC/=REGISTER/=FORMULA). These are the primitives used to download payloads, write files, and start processes from an XLM macro without invoking VBA.
  • 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 https://thersnyc.com/fxcS6exSJr0/04.html
    • https://justverify.online/ZKrubZZn5V/04.html
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
emf_00.emf
442eb38c1c88060cf62c1fd88f48f9b8961edd687fe9250cf42ff79baf20ccae		 ooxml-emf OOXML EMF part: xl/media/image1.emf 296536 bytes
xlm_sheet_00.xml
e2d0c69c580969a640d565ee7f4c9f99c84cac5b5d64c997ece3e584778305c8		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1638 bytes
xlm_sheet_01.xml
8877d538d505af08b0c326ee597bc05eb27a221881758da594814f19457722a4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 3709 bytes

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