Office (OOXML) / .XLSX malware analysis — malicious · 934e6e698f9e4f3b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6aaefc2cc503a997f31188c815488d01 SHA-1: 83a3e3b9811bc65ddb425978d2970ace1b9067a7 SHA-256: 934e6e698f9e4f3b5e23f258238c154fee92652cc606d883dfbb082ee34df857

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. While the macro content is truncated and heavily obfuscated, the presence of these macros suggests an attempt to execute arbitrary commands upon opening the document. This is a common technique for initial access or payload delivery.

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` `465d7e758df58582e3da748b2132f7ce904018b54614518913cff5f1e4710d49`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	638901 bytes

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