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

Static analysis result for SHA-256 f5d7b44922bb2897…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: ba261b6a421e36e0704b4c40bbe03681 SHA-1: 01725e357a5d63b98fa6eee142d2582ca513a2d2 SHA-256: f5d7b44922bb289718d4498f877378d14c0993fae88b02bf5b0b74ece3dd5d6d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Scripting - Microsoft JScript/VBScript

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions like RUN and ShellExecute, suggesting it's designed to execute arbitrary code. The embedded URLs likely point to the download location for a second-stage payload. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports 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://avra.dtmh.gr/ds/231120.gif
    • https://avra.dtmh.gr/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
8b13557c7c753c9d978b32b1134fab6c924344fc591b06bd0cf8f75d5ca380b6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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