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

Static analysis result for SHA-256 526860e36dbd8f54…

MALICIOUS

Office (OLE) / .XLSX

193.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: c28d667e573b95c2d59fcda30412589e SHA-1: 613cb4c1afd7b48992da9d8bf965a2a146c23226 SHA-256: 526860e36dbd8f546d8877d83b1e2f0a62a204240167b061274edcbaa318095f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 (XLM) macros, specifically triggering critical heuristics for an Auto_Open defined name and high heuristics for dangerous formula APIs like RUN. This indicates the macro is designed to execute arbitrary code upon opening the workbook. The presence of the URL 'digitizedental.co.uk/apps/digi.' suggests it may be used to download a secondary payload.

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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