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

Static analysis result for SHA-256 b9f95c565dfd8118…

MALICIOUS

Office (OOXML) / .XLSM

109.5 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: b3ea73b5c1a80d16999d596ae4539519 SHA-1: 588d71e9622f65a7c7bc31055aa6dd0a836b527c SHA-256: b9f95c565dfd811880e0857829df23802a270d1d4d39d1735ce0e9dbf6505d7f
208 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) containing an Auto_Open macro. It utilizes dangerous XLM functions like CALL and EXEC, which are commonly used to download and execute payloads. The embedded URLs in the document body are highly suspicious and likely serve as the source for this secondary payload. No specific family could be identified, but the technique is consistent with macro-based malware delivery.

Heuristics 6

  • 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: EXEC, HALT, FORMULA, WORKBOOK.HIDE, CALL 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.
  • Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
    Excel workbook contains 1 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
  • 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://giftsonlinejo.com/drms/ind.html
    • https://kurtos.eu/drms/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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
def365b5d7a87e6d02a6e16eb8f12a49fdc817651fd2675b7065c2f67b4c736b		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 3531 bytes
xlm_sheet_01.xml
7533330654b8e753d53bb8f9ac5e758b933e3ee32dea384bde4afa6209ed2d29		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 205649 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s).

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