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

Static analysis result for SHA-256 db5ef5ba06bfbe7f…

MALICIOUS

Office (OLE) / .XLSX

193.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: 6bfd9168fdbb84edce0ffb0208fed82a SHA-1: 51ce3b61e2d8b56c9f77561742bc31e133da2192 SHA-256: db5ef5ba06bfbe7f389d6e0c9a620b8338fbd94c0d226db3a9559a8851419bcb
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristic firing for OLE_XLM_AUTOOPEN_DEFINEDNAME indicates the presence of an Excel 4.0 macro sheet with an Auto_Open entry. The high heuristic firing for OLE_XLM_DANGEROUS_FN further confirms the use of dangerous functions within these macros, specifically the RUN function. This strongly suggests the macro is designed to execute arbitrary code, likely downloading and running a second-stage payload from the embedded URL. The document body contains a suspicious URL that may be related to the payload delivery.

Heuristics 4

  • 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 high 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.
  • 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.iec.ch
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
732bfa752b66213cfed6fb95799054a82ee4bf330cc7b9914a7ec49aa3f08d0f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 12026 bytes

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