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

Static analysis result for SHA-256 4eb459306aa031be…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f272f9c8b1bd5c7e8d57ca8f3e734a63 SHA-1: 1e542acca8a710a45b342de550330fbce09f1124 SHA-256: 4eb459306aa031beff023c4af433562e87e54ceef5708fe1921fca95a79c7642
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The presence of Excel 4.0 macros, specifically an Auto_Open function utilizing dangerous APIs like RUN and ShellExecute, strongly indicates malicious intent. The XLM macros are designed to download a second-stage payload from the provided URL. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this, suggesting a downloader variant.

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 http://ski-travel.pl/ds/231120.gif
    • http://ski-travel.pl/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d0d7060848f9e43377c289847dba3120f97cf87e725bc4bc328c35415fe210f7		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6298 bytes

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