Office (OOXML) / .XLSX malware analysis — malicious · 464183d2a4368b94

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 97268cb8e3a067e2d97ca3edb77569a6 SHA-1: 0dfd674d9a5cdf4a11ceee26010bb1444411f1c3 SHA-256: 464183d2a4368b944ce1996fa53fbe49e63337961bfa3df9b6865bc11c905d73

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. The embedded macro content, though truncated, contains strings that appear to be a path for a second-stage payload, likely intended for execution. This suggests the macro's purpose is to download and run additional malicious code.

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` `1663b93ecd1f5c32de1fad50f1eb0acde2263f20608ed9835ba9dc287f65b893`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3940 bytes

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