Office (OOXML) / .XLSX malware analysis — malicious · 19d58cd2a0cc6d73

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: fcc4e3f10d677af49364574c390ce41b SHA-1: dc255291e63905f4f4676fe93004a76559b92188 SHA-256: 19d58cd2a0cc6d73d21a49abe73938e161642e94fee443dde7a1edd7e13d4a3f

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications

The sample is an Excel file identified as containing Excel 4.0 macros. The presence of these macros indicates a likely attempt to execute malicious code upon user interaction, such as enabling content. No specific IOCs were extracted, and the macro content was too truncated to determine the exact payload or further actions.

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` `36c472ad0346e1d61b1ac1fa282b2731d138771fcf0018dc88ab81451846cd4f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	221236 bytes

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