Office (OOXML) / .XLSX malware analysis — malicious · 22f9965daac61085

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6c7a8b242f83acfc0ebf4ebc4a10f357 SHA-1: 3cdb6027fbafe8894f28e1a6394889e6089317a4 SHA-256: 22f9965daac610851cceab322a116a85f7325ff8fba869107e365fbf15ee10ae

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are capable of executing arbitrary commands, suggesting a malicious intent to compromise the user's system. The specific commands executed by the macros could not be fully determined due to truncation in the provided evidence.

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` `1561d62dbb1b5c76f964475513090434994b91ec4b64c4132455a607f7455128`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	639299 bytes

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