Office (OOXML) / .XLSX malware analysis — malicious · 393c35faba9c6be6

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6de0ebb9932bd05cad9755ae43bd3d44 SHA-1: 25ede8a68052061510fffe1c258a72fb7c8c5b38 SHA-256: 393c35faba9c6be62e0d5fac46b745be50354625283568fe9001ceb925ce7155

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to execute arbitrary commands or download malicious payloads. No specific commands or URLs were extracted from the truncated macro content, 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` `146bf2e04eac561b18b144c8803c1c7f0582a68817e0809b18c124d497eeed61`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	6742 bytes

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