Office (OOXML) / .XLSX malware analysis — malicious · 9fe3300212bcdbba

MALICIOUS

Office (OOXML) / .XLSX

338.6 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 8698a1c8193ceb1ffc794765ad352071 SHA-1: 6961071be47540d894e3d268e9bc2f8af6fc692e SHA-256: 9fe3300212bcdbba2d67e270808735d17d9311f6b0076edf8b00b354fe5d4f65

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros. These macros are often used to download and execute additional payloads or perform other malicious actions. No specific IOCs were extracted, and the macro content was truncated, limiting further analysis.

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` `8d04a116f937c23cf1426e3418dfb82cd203e6c05a7b63bde97e84ccd5d2f3d1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	611673 bytes

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