Office (OOXML) / .XLSX malware analysis — malicious · 46d606be448bb92a

MALICIOUS

Office (OOXML) / .XLSX

120.2 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: b864c41327eb0fc191086b0f2a4d700e SHA-1: 751d8d89181ea0b8e6f6b7f717b77685814da624 SHA-256: 46d606be448bb92ad305642408c44317a2168b02b067d27d252187be0b7ef2ae

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. While the macro content is truncated and heavily obfuscated, the presence of Excel 4.0 macros strongly suggests an attempt to execute arbitrary commands upon opening the document. This is a common technique for initial payload delivery in macro-based attacks.

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` `c62174d7456a814031e34069b8d472c8435963eb8416a4f546107506af9b166d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4856 bytes

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