Malicious Office (OLE) — malware analysis report

Heuristics 6

• Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
  oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
• XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
  Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
• Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
  Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
• 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
• Document signing service impersonation lure medium SE_DOCUSIGN_LURE
  Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
• 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://www.w3.org/1999/02/22-rdf-syntax-ns# In document text (OLE body)

  • http://ns.adobe.com/xap/1.0/mm/In document text (OLE body)
  • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OLE body)
  • http://ns.adobe.com/xap/1.0/In document text (OLE body)

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