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

Static analysis result for SHA-256 b2d0852370592dc3…

MALICIOUS

Office (OLE) / .DOC

222.0 KB Created: 2020-04-07 08:55:27 Authoring application: Microsoft Excel
MD5: e983b4c139bf2c6d45ca8e05337666d0 SHA-1: f70e8bfbbbbf5bf77416cf8eee33b01fa1f03619 SHA-256: b2d0852370592dc308142b6c7f1d32a0551d80f98322cd8b00b2d8e35f6c0300
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell

The sample is an Excel 4.0 macro-enabled document. Heuristics indicate the presence of an Auto_Open macro that uses dangerous formula APIs, specifically the RUN function, which is highly indicative of arbitrary code execution. No document body text or scripts were extracted, but the XLM macro sheet itself is the primary attack vector. The embedded URLs are confirmed benign and likely unrelated to the malicious functionality.

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://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.microsoft.com/photo/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4975bdf5e1ac90a70918312b47e39031f7fb8c3f0aee54c4c182880eaa6571bb		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 42532 bytes

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