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

Static analysis result for SHA-256 85f192a954a26440…

MALICIOUS

Office (OLE) / .XLSX

192.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: f32afde8dfb244d8e9afc9d2952b8318 SHA-1: 9e19bf42d5f80fded78e515c9788b7acb2ea4b1b SHA-256: 85f192a954a264402cd5fe9351de358e2a62ec79c8ee752bf1d98b2ffd1c338c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1059.001 PowerShell

The sample contains an Excel 4.0 (XLM) macro sheet with an Auto_Open function, indicating it is designed to execute malicious code upon opening. The presence of dangerous formula APIs like RUN suggests it attempts to download and execute a second-stage payload from the embedded URL. The document body text is fragmented but hints at a lure related to document processing.

Heuristics 3

  • 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
e28030e9d0d14a61d3f2dd5f3a502fe7843136dbc944ec7883cb7b380a59fbd9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 12125 bytes

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