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

Static analysis result for SHA-256 6c1fdee9b69b6eb4…

MALICIOUS

Office (OOXML) / .XLSX

65.7 KB Created: 2021-03-14 21:03:27 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0f643d82af7f4daccccfb24cdf3f63f2 SHA-1: e34f37bc019d659a10e942c27b601be5fbe7d313 SHA-256: 6c1fdee9b69b6eb4e1c8a3f3defd32f346aea9d464ad51c1aca45d1359fa6e62
60 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of Excel 4.0 macros within an XLSX file. These macros are known to be used for executing arbitrary commands, often to download and execute further stages of malware. The truncated script content prevents a more detailed analysis of the specific commands being executed.

Heuristics 1

  • Excel 4.0 macro sheet (1 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
68df26852dec3c35f83f37080f11e1087c547b18bddbd5f214be71377af4e047		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 95567 bytes

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