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

Static analysis result for SHA-256 4b67e7e7da3931ea…

MALICIOUS

Office (OLE) / .XLSX

329.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: cd625b2b3606c563eac845e3b7c8a1b9 SHA-1: 8bbcc9f42f198693e08f953c13be030b893fd9cc SHA-256: 4b67e7e7da3931ea0d4125595e92d6d25d02f2eae0a1f5b9357c5999b35e5d68
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The presence of Excel 4.0 (XLM) macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, indicates an attempt to execute arbitrary code. The heuristic firing for ShellExecute further supports this, suggesting the macro is designed to download and execute a payload. The embedded URL likely points to this secondary stage. The document body's reference to DocuSign and a GIF file, combined with the URL, suggests a phishing lure for credential theft or malware delivery.

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://bemojo.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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