Office (OOXML) / .XLSX malware analysis — malicious · 2ae03b57777d7f42

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 192e08b4790ceb525ce53476103064e9 SHA-1: c64857d4c958dd20be72479074d95465b9cd8b9c SHA-256: 2ae03b57777d7f42699e0d0912f19c4bf3c99f991d8f8b021427a2d284057b5b

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. 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` `f51ec40ed508098f69c568cca75c01cf461246ffd262e61d5df16c2399a8413c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7430 bytes

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