Office (OOXML) / .XLSX malware analysis — malicious · a97879e2c2d2229c

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f634681907ba4d6c06150b4cae950259 SHA-1: 88920b978e7fbb67ee92058258d2084a4825c067 SHA-256: a97879e2c2d2229c9c1ddc1720ea22042692a71e391f24b64a9d120aae6de942

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The primary heuristic indicates the presence of Excel 4.0 macros. Analysis of the macro sheet reveals embedded commands that appear to construct and execute a path to a program, likely 'C:\Program.exe'. This suggests the macro's purpose is to download and execute a second-stage payload. The macro content is truncated, limiting further analysis and confidence.

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` `71af0e841e5941e8339301a08ef7d759d02215790e169d2d7a03434909234ab0`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3598 bytes

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