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

Static analysis result for SHA-256 e2a455e64ed4f485…

MALICIOUS

Office (OLE) / .XLSX

192.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel
MD5: a7bee5a5d096719b81da34591415d866 SHA-1: 1e94940395b2052e7a314d56e90d9ae25f116b30 SHA-256: e2a455e64ed4f48545fc175f8c867160cad738690e5ce6d2e7bc8cbe3a0ce6af
60 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically triggering an Auto_Open function with dangerous API calls like RUN. This indicates the macro is designed to execute arbitrary code. The presence of a URL within the macro sheet suggests it is likely a downloader for a second-stage payload. The document body text is heavily obfuscated and does not provide clear user-facing content, but the macro execution is the primary threat vector.

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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