Office (OOXML) / .XLSX malware analysis — malicious · cade31d51d4ee707

MALICIOUS

Office (OOXML) / .XLSX

76.5 KB Created: 2021-03-14 19:50:37 UTC Authoring application: Microsoft Excel 16.0300

MD5: 6a2c98c5cf4994a7a029b098af49e08f SHA-1: 9e2686ed4bf74baa346b8155e53c1c66238f0b14 SHA-256: cade31d51d4ee70763ed8e5b11beb699e7c7b913e43198146baae6df5d177510

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing a macrosheet, identified by the OOXML_XLM_MACROSHEET heuristic. The embedded XLM macro sheet, 'xlm_sheet_00.bin', is heavily truncated but its presence indicates an attempt to execute arbitrary code. While the exact payload is not discernible due to truncation, the structure strongly suggests a downloader or initial execution stage for a malicious artifact.

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` `b2408d0b6c593d5edd3aaf5ea23f0796ace10bfc1a0a7658009a14a543f61ffe`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	97004 bytes

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