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

Static analysis result for SHA-256 b3b982347436c252…

MALICIOUS

Office (OLE) / .XLSX

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5183f4b244b699578aa4808c41a90398 SHA-1: 78fb6bc8ac18b76f2baabdd1c7cac300225a52e5 SHA-256: b3b982347436c252a1e2dac34d04afd048a46137b4ac4b14b1a3aef472b6f969
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 an Auto_Open macro that utilizes the RUN function, indicating an attempt to execute arbitrary code. The presence of ShellExecute API reference further supports this. The embedded URL is likely used to download a secondary 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 http://cloud.c-tes.gr/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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