Office (OOXML) / .XLSX malware analysis — malicious · 95f6e0233ea3baf6

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 25ce25759d47db9528f7fdffc529ef1b SHA-1: cff96761ede944dd37c1c77bb252523a1573f7ae SHA-256: 95f6e0233ea3baf6ce84716b36b606b90bafb8eb8d9aa20ee4148f72654299f7

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, which is a known technique for executing malicious code. The macro sheet content is heavily truncated and obfuscated, preventing a detailed analysis of its specific actions or payload delivery. However, the presence of these macros strongly suggests an intent to execute arbitrary commands upon opening.

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` `bdb986d83be3ba256f7adae7f15e115f5322d7f35eb0be71f12619cd52937c55`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	285376 bytes

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