Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 b8e74adf71b07d71…

MALICIOUS

Office (OOXML) / .XLSX

226.7 KB Created: 2021-06-05 08:40:43 UTC Authoring application: Microsoft Excel 16.0300
MD5: f3852fcff10b37f639e2c63bd70ba32f SHA-1: 8adfd7471d95891a96e3aa018fd4918fb72a09d4 SHA-256: b8e74adf71b07d71b9139f5868d2450db293ae79ab226ed87095b366bd0ee02e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an Excel 4.0 macro sheet. This technique is commonly used as a loader for other malicious content, such as downloading and executing further stages. Without additional script content or network indicators, the specific payload and delivery mechanism remain unknown.

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.

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