Office (OOXML) / .XLSX malware analysis — malicious · 968ed5f5fbf0b466

MALICIOUS

Office (OOXML) / .XLSX

69.7 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 16.0300

MD5: fccf9ac7d9db45ce6dae839ab0660a28 SHA-1: ab408309380f26dac93fb1aa81e8da7035fff8be SHA-256: 968ed5f5fbf0b4666905b104eb77371942716fbfc2e240fc2c7eb4a99a9265c2

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are capable of executing arbitrary commands, which is a common technique for initial access or payload delivery. However, the macro content was truncated, preventing a detailed analysis of its specific actions or the reconstruction of any URLs or 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` `a39deb98d8124f96b782ec5408841786c5ab4ff1ae0723730075ba5386b1df77`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	1291753 bytes

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