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

Static analysis result for SHA-256 636d765ef4c41abb…

MALICIOUS

Office (OOXML) / .XLSM

78.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 5c903320210ab71498a3f8fcd51dface SHA-1: f01b71442be101ebc7d8df1e74f034a1965ee57f SHA-256: 636d765ef4c41abb326e06e04bf3d812d92f99207ce7a3abebcc87a314f4e9ff
182 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an XLSM document containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros utilize dangerous functions like CALL and HALT, and the embedded URL points to a suspicious domain. The macros appear to be designed to download and execute a second-stage payload, likely the file 'sdhind.exe'.

Heuristics 4

  • 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: HALT 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 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
emf_00.emf
ab58818ae1864807b22f8a58a75f7fa8703ecb19a2352bdb47469f366b868e59		 ooxml-emf OOXML EMF part: xl/media/image7.emf 1108 bytes
xlm_sheet_00.xml
b0e85f6bacf2890dc468a4764fcbce58b394ed7e564bc0b3da61c56304c19129		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 1191 bytes
xlm_sheet_01.xml
306ff6a7899a074e0a012be462c396a92105fbe2e1be1a05082e864765645191		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 1977 bytes
xlm_sheet_02.xml
18d2ba72cca43907b6d94db49251f3b93c6db105d752d00819dcdc7382d0f43f		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet3.xml 993 bytes

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