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

Static analysis result for SHA-256 c7f5fed97c922649…

MALICIOUS

Office (OOXML) / .XLSM

110.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 595efbe7f48448fa19ef448a7f8911ef SHA-1: 39cfc287b50054742fee32a0008e18792e3a8c8f SHA-256: c7f5fed97c922649d8b6711e952b7340adc77897655f24da4c55b88bd6b7c58c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample is an Excel 4.0 macro sheet (XLSM) that utilizes dangerous functions like CALL and EXEC, indicating an attempt to execute arbitrary code. The document body explicitly contains URLs that are likely intended to lead the user to download a second-stage payload. The presence of these functions and the explicit URLs strongly suggest a downloader or droppper functionality.

Heuristics 5

  • Excel 4.0 macro sheet (3 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: EXEC, HALT, FORMULA, CALL, WORKBOOK.HIDE 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.
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://kurtoch.eu/RGFYZRXlR/ind.html
    • http://myplanet.group/XuxZrYvq1/ind.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
xlm_sheet_00.xml
6d2587730d575d65758c76346fee2472fb2f7b6fe61081090157e25c607f964d		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet3.xml 1162 bytes
xlm_sheet_01.xml
14a421c46518f359e63e7e9602dd442360619aad0738e8e1b654fa232483751b		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 4353 bytes
xlm_sheet_02.xml
fdaa037b71445ea5f7b4f9bd93032cf35bc48cb7f3287d55b838fb9c2b5a76ca		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 205064 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).

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