Malicious Office (OOXML) / .XLSX — malware analysis report

Heuristics 5

• Excel 4.0 macro sheet (25 sheet(s)) high 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.
• Macro/content-enable lure medium SE_ENABLE_LURE
  Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
• Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
  One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
• Hidden worksheet (hidden) low OOXML_HIDDEN_SHEET
  Excel workbook contains 25 hidden sheet(s) — hidden sheets are commonly used to conceal macro code, staging data, or intermediate payload construction
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL http://schemas.openxmlformats.org/spreadsheetml/2006/main

  • http://schemas.openxmlformats.org/officeDocument/2006/relationships
  • http://schemas.openxmlformats.org/markup-compatibility/2006
  • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
  • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
  • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
  • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

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