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

Static analysis result for SHA-256 76ecceec53b20bf0…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fbd134366a44567f227e734ce06e8f03 SHA-1: 4133a096dbbb87479be92972ded8aae735afe293 SHA-256: 76ecceec53b20bf0bc0a55d3318e79932c0eb57e51c88ddb03e4dabb59b4730a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting - Microsoft JScript T1059.001 PowerShell T1059.003 Windows Command Shell

The presence of Excel 4.0 macros, specifically an Auto_Open function utilizing dangerous APIs like RUN, strongly indicates malicious intent. The heuristic firing for ShellExecute further suggests the execution of external commands or files. The embedded URL likely serves as a distribution point for a second-stage payload, as indicated by the ClamAV detection name 'Doc.Downloader'.

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://boatssa.com/ds/231120.gif
    • https://boatssa.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
96eae7b570d4a9d4f225045676982008ec43ffa50f8643e2397db329f3c9bb6b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6059 bytes

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