Office (OOXML) / .XLSX malware analysis — malicious · 1aec14598dc1cf4b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: b97d7a86848b28232c7cd7bad6463cab SHA-1: 7611b4ca4f41acca97a203e44af3c931dfac2cb3 SHA-256: 1aec14598dc1cf4b51ae211703872bff744d134c74d60f6accb8a6f8d7c01989

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, which are known to be used for malicious purposes. The macros are heavily obfuscated and truncated, preventing a detailed analysis of their specific actions. However, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands.

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` `59579b11126c6cc92ff43d2995b69965990b245dd9244e5a437c3eec2b03508d`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	441932 bytes

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