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

Static analysis result for SHA-256 3d130db31a290931…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d096b40a575e7e0ff87e5360b493467a SHA-1: 0e6946e35042e79f476239d4f8aef1629fd81322 SHA-256: 3d130db31a290931b898104188ab6ab339999cb76ae6791903a3ac9b59ecbc4b
160 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros, specifically an Auto_Open function utilizing dangerous APIs like RUN, strongly suggests malicious intent. The heuristic firing for ShellExecute further indicates that the macro is designed to execute external commands. The embedded URL likely serves as the source for a second-stage payload. The ClamAV detection as Doc.Downloader.Docusign0521-9864805-0 supports the downloader classification.

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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