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

Static analysis result for SHA-256 51f8c9e1b912f0a4…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 70c084a9d1bc0a4ccf3bdac0d24925e5 SHA-1: aeb3f6d4e77b72644442cc24d7cf0bb0b3a61f87 SHA-256: 51f8c9e1b912f0a475bf7058528a3ed385aba910d1d541ed747b6a2005c7c5b0
160 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, strongly suggests malicious intent. The heuristic firing for ShellExecute API further indicates that the macro is designed to execute an external payload. The embedded URL is likely the source for this payload, pointing towards a downloader attack pattern.

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://ismailiyamedical.com/ds/151120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
89aad7b8576d8f84c1934acd2fc0826a9bcea7c600ce1ac7e8579bafe1fef843		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5602 bytes

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