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

Static analysis result for SHA-256 3d3af6538a594ec4…

MALICIOUS

Office (OLE) / .XLSX

329.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2b98f471920c86ec21a436dbbee21544 SHA-1: 29419c61d9f29dd7f560d3558757df9f6a34d786 SHA-256: 3d3af6538a594ec4642247a022ab25f1df792d9a55478ba51fd264d6bf396f00
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically triggering the 'OLE_XLM_AUTOOPEN' and 'OLE_XLM_DANGEROUS_FN' heuristics. The 'SC_STR_SHELLEXEC' heuristic indicates the use of ShellExecute, which is further suggested by the embedded URL and the 'gif.nomzoo.ml/ds/161120' string in the document body. This points to a downloader functionality, where the macro likely executes a command to fetch and run a payload from the provided URL. The ClamAV detection 'Doc.Downloader.Docusign0521-9864805-0' reinforces the downloader classification.

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://nomzoo.ml/ds/161120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b74fbb14c9dd0283fe5b35630158622cf58bbddcd03d161d30bf64d1f40271a4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7889 bytes

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