Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cb7a2a44599041b1…

MALICIOUS

Office (OOXML)

94.2 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300
MD5: 97ef12bbe279a9c72f1fb0b9d31b6bbe SHA-1: 6b6dac77278c51f88bb81a6bd221e5fa5277c4a2 SHA-256: cb7a2a44599041b1f415289bdeba184d0d0c2e58046eb918f124a32a38263c66
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macro sheets, which are known to be used for malicious purposes. The macros likely serve to download and execute a secondary payload, a common technique for initial compromise. Due to the obfuscated nature of the extracted macro content, specific URLs or commands could not be confidently reconstructed.

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
3f8db13af710fc4012ee5afb18ac21606b10f6307f1ca1192d9c191e0487c25b		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin 9034 bytes
xlm_sheet_01.bin
f697ee5ed6aa2dc2333e560eda58b21fd0a9b4315f1cc12bcc32630116f57256		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin 1176 bytes

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