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

Static analysis result for SHA-256 fc4793eda38ee181…

MALICIOUS

Office (OLE) / .XLSX

329.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 9916a37f4b12c5b2f309c25bbe61cbe2 SHA-1: b18d7a663ee0340f9aa8f8c5c5a6fd8627428be6 SHA-256: fc4793eda38ee1818e4f6d6d811d616f6cfe7ddd279ca01880b02e5f18368c87
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 indicates malicious intent. The ShellExecute API reference further suggests the execution of external code. The embedded URL is likely used to fetch and execute a secondary payload, consistent with a downloader attack pattern. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' also supports this assessment.

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://i.sfu.edu.ph/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e17e7cc4a238aa7ef2e84a739a77bbc946bb2881b6aa82203097e9ab8210d20f		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6273 bytes

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