Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 c3d65d179f762bc3…

MALICIOUS

Office (OOXML)

62.9 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-06-17
MD5: acf6faf1fc7e8e15108ea0b5ea051477 SHA-1: 7d1fd1f80f06d9859114a8818a79d8c8364720fa SHA-256: c3d65d179f762bc31431d3b9b76adfdcaaa36c963ae95fe43f45c429efdbd985
60 Risk Score

Malware Insights

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

The file is an Excel document containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros themselves are heavily obfuscated, but the presence of XLM macros strongly suggests an attempt to execute arbitrary code, likely for downloading and running a second-stage payload. The specific commands or URLs are not directly discernible from the provided macro content.

Heuristics 1

  • 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. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 1284 bytes
SHA-256: 61c86c6d83897319106ad1111b11750170a262e822e92dd4132e2d216c1b3436
Preview script
First 1,000 lines of the extracted script
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xlm_sheet_01.bin xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet2.bin 1169 bytes
SHA-256: c3b8db8f1200fbfa8d0fd068f7e0793a50b78e7cfbdd9a4987503d7a9bda3e74
Preview script
First 1,000 lines of the extracted script
�  �  �   @      ��������    �  
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       ,        1   4     1       
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