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

Static analysis result for SHA-256 3fcf8fc367bf0b66…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 349da15d16ae621431447a28480dba83 SHA-1: 0b137e8b6bc3e8ac8998cb0439a6f1c2667af832 SHA-256: 3fcf8fc367bf0b66dff6ed40597161890d5bb8a399eff43d003c6ff11be2423b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

The presence of Excel 4.0 macros, specifically triggering the Auto_Open function with dangerous APIs like RUN, indicates a malicious intent to execute code. The heuristic firing for ShellExecute further supports this, suggesting the macro attempts to launch external processes. The embedded URLs are likely used to download and execute a secondary payload, aligning with 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://fisicamp.com/ds/231120.gif
    • https://fisicamp.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3ee92379b19800bb1e16b96d76e4f31800c6dabf549bf8665d8d4ceab7eae6c0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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