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

Static analysis result for SHA-256 1ca2f707c1437ca8…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 275bf4db6754ce1dcdb08ada9a3b229c SHA-1: 1f46628cf490aee7a7701b5de72f7da692116814 SHA-256: 1ca2f707c1437ca86abab56b5e9ea9ca1caa6cf1c3281038f83d099ed4f287e7
160 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros, specifically an Auto_Open function utilizing dangerous APIs like RUN, indicates a malicious intent to execute arbitrary code. The heuristic firing for ShellExecute further supports this, suggesting the macro attempts to download and execute a payload from the embedded URL. The ClamAV detection as a downloader reinforces 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 https://kenas888.com/ds/231120.gif
    • https://kenas888.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
6dd2ce04afad0a05495adb4f6301aeb41dcc78e9673b9399eb28871054a28e1a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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