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

Static analysis result for SHA-256 4c3cac902fb1f65e…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a9e1c7bc1ece3c1f65fe2150f3a0765f SHA-1: 75bd89ee9034a32284b69981123f6e969c9b5107 SHA-256: 4c3cac902fb1f65ed4983709784fb467c49b768025fedabb34174eaa16c96bf7
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 an Auto_Open function that utilizes dangerous formula APIs like RUN. This indicates an attempt to execute arbitrary code, likely to download a payload from the provided URLs. The presence of ShellExecute API references further supports this malicious intent. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' also 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://bgms.co.in/ds/261120.gif
    • https://bgms.co.in/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e213645668ce9f5d68f4226afb5b9b5e6c2ad49807658d9b833212b471c7c00d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6675 bytes

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