Office (OOXML) / .XLSX malware analysis — malicious · 04f6d19f6e3d2ced

MALICIOUS

Office (OOXML) / .XLSX

81.3 KB Created: 2021-02-26 07:53:41 UTC Authoring application: Microsoft Excel 16.0300

MD5: e71517ccc3628100907ecb5a480b9a12 SHA-1: 5b3c7cdf3b43b82c5b572c89570beac13bf9a199 SHA-256: 04f6d19f6e3d2ceda78a185519b00e3af6cb471134949c69273ab02b31c24d28

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel spreadsheet containing Excel 4.0 macros, identified by the OOXML_XLM_MACROSHEET heuristic. These macros are capable of executing arbitrary commands, which is a common technique for downloading and executing further malicious content. The specific commands within the macro are truncated, preventing a more detailed analysis of the payload or IOCs.

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` `689e16d95847b0ba7596ec56e760b2d0da23f45ec6e7b511af1e8716fb6fc92b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4569 bytes

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