Office (OOXML) / .XLSX malware analysis — malicious · 6b7270d290ae785e

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: ebd8d505db5812357c29ece3a10581ae SHA-1: bcc6008e3146cf5907db5c3029b9ae3e57f4163d SHA-256: 6b7270d290ae785e4e420aec9ae7fe48cc325f65138e93307e2d21cecd9aa898

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. These macros are capable of executing arbitrary commands, which is a common technique for initial execution or payload delivery. No specific family could be identified due to the truncated script content.

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` `829d0812b38478ed325be2b96655d881d16f1fff0fd56aae856d3e310443afe6`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	625765 bytes

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