Office (OOXML) / .XLSX malware analysis — malicious · cbff52d8f8dcc262

MALICIOUS

Office (OOXML) / .XLSX

85.5 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: c0438e8e2ed3054f0219a05e33bb4c49 SHA-1: 84ca08e16a3334078e5d3546c636749f9e237731 SHA-256: cbff52d8f8dcc262a9671d9f43cca53e821bbd42a2f94c6d515e5760ef5f4922

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of an Excel 4.0 macro sheet. Analysis of the macro sheet reveals a path that is likely used to stage or execute a payload. The macro sheet appears to be a downloader, attempting to execute content from the specified path.

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.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `745e66b54dfd886c544102d42afa698434a28321315fa96970bcce596667d371`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4714 bytes

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