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

Static analysis result for SHA-256 b6d3a43bebbc3a50…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 8ef7a5116e6709c89eb73f418616b40a SHA-1: 64770f868787e4a9f93e206dfb3a3a9045e246f9 SHA-256: b6d3a43bebbc3a500de21794cf0eecc57155893d33cba7e907826f016cf2c461
160 Risk Score

Malware Insights

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

The file contains an Excel 4.0 macro (XLM) with an Auto_Open function that utilizes dangerous APIs, specifically the RUN function, which is often used to execute arbitrary commands. The heuristic firing for ShellExecute further supports this. The embedded URL likely points to a malicious payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a downloader functionality.

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://feromon.shop/ds/231120.gif
    • https://feromon.shop/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
367ec1ce7aaed8f0977647fda6a625a5496cb60a2906548fc328342f8d2ce8db		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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