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

Static analysis result for SHA-256 0533345eabfe77b6…

MALICIOUS

Office (OOXML) / .XLSM

79.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 14.0300
MD5: 5714c0df3ee0690df05c3cb0fa9b1439 SHA-1: ba63bb0054d742f781515f9f5dc6a8cd71a46b03 SHA-256: 0533345eabfe77b6223db0e07d8de4d2ddf9b66bb8ddd62d87f0b1ae53503e6b
182 Risk Score

Malware Insights

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

This Excel file contains Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLM_AUTOOPEN_DEFINEDNAME heuristics. The macros utilize dangerous functions like HALT, which can be used to download and execute arbitrary code. The embedded URL http://h1iv5g3yz9wro9r.xyz/index.php and the dropped executable name ..\ejdsos.exe are strong indicators of a malicious payload delivery.

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: 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.xml
28e52d7e2fb80e83860cbc3aa2120474f76363e1d1a52b0f1dbe30ed29be5527		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.xml 23546 bytes
xlm_sheet_01.xml
580994e4c7f9f26f9667c27d3b3eecd885fab0c964462b9a92e345261fcfd57a		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.xml 3587 bytes

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