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

Static analysis result for SHA-256 fc0c519bf9c49905…

MALICIOUS

Office (OLE) / .XLS

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 4cccadb8bf49a5889aec66f14caf1c85 SHA-1: d99841829dda91afe61e3e37c730f3a7fab31378 SHA-256: fc0c519bf9c49905ffaae2f65ad12c581f2d9b5acd66eec30156be399b40ec52
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and potentially others to execute code. The presence of ShellExecute API calls further indicates an intent to launch external processes. The embedded URL likely serves as a distribution point for a second-stage payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests a downloader functionality, possibly disguised as a DocuSign-related document.

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://dtmh.gr/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c8d4504c98e732b3946f99214663fda76453297a5fc2e4e085c3ff1af974258c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6293 bytes

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