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

Static analysis result for SHA-256 4c766f714c780278…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fc592202d2169a0b60b44a62e5b9ce24 SHA-1: 3affeebb72ffd87c1ec8fa4e8120d523375fe29f SHA-256: 4c766f714c7802783147625837e8ec0b481e384f9071ffe0bc2b7bdabe9bec4f
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 (Auto_Open) that utilizes dangerous functions like RUN, indicating it's designed to execute arbitrary code. The presence of ShellExecute API calls further supports this, suggesting the macro is intended to download and execute a secondary payload from the provided URL. The ClamAV detection name 'Doc.Downloader' reinforces the 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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