Office (OOXML) / .XLSX malware analysis — malicious · a47e33770c332147

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 0279851b032cc96691808f587f953a6a SHA-1: ac5e27898cf9667792953d7df70fb86417b8841c SHA-256: a47e33770c332147b09ca920657e3744793dbc4cdeea8b5e17ae409bdf4933d9

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The embedded macro content, though truncated and partially unprintable, contains strings that appear to be paths within the ProgramData directory, suggesting an attempt to stage or execute a payload. The macro's intent is likely to download and execute a second-stage payload from a location specified within the macro itself, which was not fully extracted.

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` `26c6c0300ee0497f800c0489ffbc93ef30c182eb1f08059deaa812ce31837159`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4352 bytes

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