Office (OOXML) / .XLSX malware analysis — malicious · 4e7962e4fd8d39b1

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 331247483bdb3a2dbb434075dfedf221 SHA-1: 3dbd6f425687f0f18b5f851a72d5cd6961460e71 SHA-256: 4e7962e4fd8d39b1c2b06bcb960cd7f21d9fd0b51ef726a403c3f35b40ae3561

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are often used to download and execute arbitrary commands or payloads. The provided script excerpt is truncated, preventing a detailed analysis of its specific actions or reconstructed 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` `cef4485b844e6eaef24081df5379ff707ac652ea97f1f7c9974d992190b4d575`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	261345 bytes

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