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

Static analysis result for SHA-256 bad02d0884c0f859…

MALICIOUS

Office (OOXML) / .XLSM

86.8 KB Created: 2015-06-05 18:19:34 UTC Authoring application: Microsoft Excel 14.0300
MD5: de4a40fb0b4a8ada6c82067cfcf54ef1 SHA-1: dcc78bb7995d7b4eb883abc9bbb8a984294ef639 SHA-256: bad02d0884c0f8591d2a02d196e9013bc8c0203f346da1ca12d16df31f05c478
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Service Execution: Service Control Manager T1204.002 Malicious File: Malicious File T1059.001 PowerShell

This XLSM file contains Excel 4.0 macros that utilize dangerous functions like CALL and EXEC. 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 use of these functions directly bypasses VBA and allows for direct Win32 API calls, indicating a downloader or droppper functionality.

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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