Office (OOXML) / .XLSX malware analysis — malicious · 030d4a6c8c5ebb9b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e73fc9b802fd807fe51158516b1d98dd SHA-1: 84a897bb2f739861da6f5c41e611728c7f6e7b15 SHA-256: 030d4a6c8c5ebb9bfc8a3e30292f91ec9603715416e8cffa9d5137c6804a8b97

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are known to be used for executing arbitrary commands, often to download and execute further malicious stages. The truncated script content prevents a more detailed analysis of the specific commands or URLs used.

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` `af7465f1a3e49eb8e8026c87f08997abf2f43bc991695206857d1f3ff5eb032e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	653803 bytes

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