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

Heuristics 8

• URL reconstructed from VBA cell-staged base64 dropper (5 URLs) critical OLE_VBA_CELL_DROPPER_URL
  VBA reads worksheet cells, strips junk substrings via Replace(), and base64/UTF-16 decodes the result into a PowerShell EncodedCommand payload. The download URL is never contiguous in the file bytes; it was recovered by removing the macro's Replace() junk tokens from the cell strings and decoding the staged base64.
• ClamAV: Doc.Downloader.EmotetExcel02222-9938901-0 critical CLAMAV_DETECTION
  ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02222-9938901-0
• Reference to Windows Script Host high SC_STR_WSCRIPT
  Reference to Windows Script Host
• Workbook_Open macro high OLE_VBA_WBOPEN
  Workbook_Open macro
• CreateObject call high OLE_VBA_CREATEOBJ
  CreateObject call
• VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
  Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
• VBA macros detected medium OLE_VBA_MACROS
  Document contains VBA macro code
• 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 https://store.uxdsummit.com/wp-admin/VfgBSQa7Z/

  • https://glowrentals.com/wp-admin/f1zeAKGTnS6I/
  • http://candisee.bminteractivegroup.com/1g94ngo/2n7lJoPuPDEanPcX/
  • http://bachilleratoporciclos.org/wp-content/zR/
  • http://formula8020.com/css/JCuR6OE404DgR/

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