MALICIOUS
120
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
The sample is an XLSX file containing embedded Excel 4.0 macro sheets, indicated by the OOXML_XLM_MACROSHEET and OOXML_XLSB_INTL_MACROSHEET_IN_XLSX heuristics. These macro sheets are designed to execute arbitrary commands. While the exact commands are truncated and obfuscated in the provided excerpt, the presence of these macro sheets strongly suggests an intent to download and execute a secondary payload. The specific macro sheet filenames are included as IOCs.
Heuristics 2
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Excel 4.0 macro sheet (2 sheet(s)) critical OOXML_XLM_MACROSHEETSpreadsheet 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.
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XLSB international XLM macro sheet hidden in .xlsx critical OOXML_XLSB_INTL_MACROSHEET_IN_XLSXOOXML 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 2
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_sheet_00.bin3f8db13af710fc4012ee5afb18ac21606b10f6307f1ca1192d9c191e0487c25b |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet1.bin | 9034 bytes |
xlm_sheet_01.binf697ee5ed6aa2dc2333e560eda58b21fd0a9b4315f1cc12bcc32630116f57256 |
xlm-macrosheet | OOXML XLM macro sheet: xl/macrosheets/intlsheet2.bin | 1176 bytes |
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