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

Static analysis result for SHA-256 bc18929238059682…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2bd770abb6eeb6f7227969230e16924e SHA-1: 215c667ebcd219824efbc5a208b4bffe74c26f95 SHA-256: bc189292380596821d85bf7a3a285b0ed8077b64696435eb1c463b0bc86bad78
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically triggering the Auto_Open heuristic with dangerous functions like RUN. The presence of ShellExecute API calls and an embedded URL strongly suggests a downloader functionality. The ClamAV detection as 'Doc.Downloader.Docusign0521-9864805-0' further supports this, indicating the malware's intent to fetch and execute additional malicious content from the provided URL.

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://new.odingrad.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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