Office (OOXML) / .XLSX malware analysis — malicious · 07f7f5ac05c7d092

MALICIOUS

Office (OOXML) / .XLSX

68.0 KB Created: 2021-03-15 18:25:26 UTC Authoring application: Microsoft Excel 16.0300

MD5: b9331085a13ece7ef497f93dcd2741d6 SHA-1: c8a844989501bf3e47266d4d5a5e083856bb0feb SHA-256: 07f7f5ac05c7d09206105d3827cdf09e69575f74a0337824ffb0c7fa19dbac0a

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, which are known to be used for malicious purposes. The macros are likely designed to execute arbitrary commands, potentially downloading and executing a second-stage payload. The specific commands within the truncated macro data are not fully discernible, leading to a moderate confidence level.

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` `5c942d7392391d4f667c0a63999e2051776c37854480ce701cc27b32eb0ef798`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	97804 bytes

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