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

Static analysis result for SHA-256 59d12a44f61fe564…

MALICIOUS

Office (OOXML) / .XLSM

82.1 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: ec065cc9af4a131361b079841c5db870 SHA-1: 453354bd2633f933fd0a879881426ee34331457b SHA-256: 59d12a44f61fe5645294318520b468527c0b067e7b8b5ff5cd1e08efc2901511
180 Risk Score

Malware Insights

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

The file is an XLSM document containing Excel 4.0 macros. Heuristics indicate the use of dangerous functions like CALL and EXEC, which are commonly used to download and execute payloads. The document body contains a URL that appears to be a payload delivery mechanism. The macros are likely responsible for initiating the download and execution of a second-stage payload.

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: FORMULA, CALL, HALT, EXEC 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
987c6c7ed4934200d493a65248ac3daca0b554a6fda3c36571732fcc583e655e		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 19707 bytes
xlm_sheet_01.xml
d30d0bdbdc3063e69afc7d3c6401429aac87693165a049927be503c06d2c964c		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.xml 1419 bytes
xlm_sheet_02.xml
644ddaecdc2c5458cffc5ad58ed19949086a06cf10b478a5857d1c4cd8813551		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.xml 6156 bytes

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