Office (OOXML) / .XLSX malware analysis — malicious · 24be2bb2ea0488e5

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 6aee35f7dc851e1c70ac7e4cfdb30317 SHA-1: b499a932a14f808a8a1baa315230a77ad87890b9 SHA-256: 24be2bb2ea0488e54bde52927a811188fd458168926e367ab11f67bef189252c

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing embedded Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily truncated and obfuscated, preventing a more detailed analysis of its specific actions or IOCs.

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` `c84f944f0b631c72e7aa8eef1004ad07da302aa0c38ffab6068ab1ba4c86d0e5`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	601770 bytes

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