Office (OOXML) / .XLSX malware analysis — malicious · 5561044c9ab4d581

MALICIOUS

Office (OOXML) / .XLSX

94.6 KB Created: 2006-09-16 00:00:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: 7f35ea6eaf84464d10991c4ffb0e9b91 SHA-1: 7b0779b34a103a9f1f281e9dea02a6fc492fe240 SHA-256: 5561044c9ab4d581c24090bef73282c3dfc149dc6808814c56c9ca2c1f173a83

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing embedded Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLSB_INTL_MACROSHEET_IN_XLSX heuristics. The macros appear to be designed to download and execute a payload from the URL 'http://ghenrope.rue'. The obfuscated nature of the macro content prevents a more detailed analysis of its specific actions.

Heuristics 2

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.
XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSX

OOXML package is named .xlsx but contains XLSB workbook parts and an international Excel 4.0 macro sheet. This hides XLM macro execution from scanners that trust the extension or only inspect XML worksheet parts. The technique is macro execution, not a document-parser CVE.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `1d86b3b52f2ca77e486b256d7c7d5bcd39881af7c02f6edc2a9373cc9635903a`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin	9817 bytes

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