Office (OOXML) / .XLSX malware analysis — malicious · 6eb00c5fee11ba0e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f44a4e2d5fe0ef1d7e24afc0ea452031 SHA-1: 225d774ceebd6d2cc7cf2c8f07de51eca7338f38 SHA-256: 6eb00c5fee11ba0e5f5237689915f837dfb76a790a544255df4d1533d08d5c01

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file contains Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are often used to execute arbitrary commands or download additional malicious content. The presence of the 'xlm_sheet_00.bin' artifact further supports this, suggesting the macro sheet is the primary component for malicious execution.

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` `dce85a72de6b25f6e8fc3eada5fcec6953bc3757fb33af77d97a0971a9853c08`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	219515 bytes

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