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

Static analysis result for SHA-256 972fb4b774f4ce9e…

MALICIOUS

Office (OLE) / .XLSX

329.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 8dc241d63c33fe14b70007fccc7e6a61 SHA-1: b2bac0e2b373d2cb1ef287aa6aeb132e9ff22711 SHA-256: 972fb4b774f4ce9ea5a7cfd35a595e8e7efdb8407d6f9feeb460858073aaf92a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting: Visual Basic

The presence of Excel 4.0 (XLM) macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, indicates a malicious intent to execute code. The heuristic firing for ShellExecute further supports this, suggesting the macro attempts to launch an external process. The embedded URL likely serves as the download location for a second-stage payload, as indicated by the ClamAV detection name 'Doc.Downloader'.

Heuristics 5

  • ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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 https://uaeub.com/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c7e4e7ed3c1ce4a0357cad7ea2d4765567912ff9637c55ef23ac64833b3a62a6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6274 bytes

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