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

Static analysis result for SHA-256 2c1c927bcb37d257…

MALICIOUS

Office (OLE) / .XLS

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bd6657100f2e55d64d188794c0ef8d20 SHA-1: 82a7e16a3589f0cb988074d07a8e84e6023c566f SHA-256: 2c1c927bcb37d257b30460ddcec6113654bae4b6383e40285e6e5babe2cba571
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1071.001 Web Protocols

The file contains an Excel 4.0 macro sheet with an Auto_Open function, indicating it's designed to execute automatically upon opening. The presence of ShellExecute API calls and a reference to a URL strongly suggests it's a downloader. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further supports this, pointing to a document-based downloader likely attempting to retrieve and execute a secondary payload from the provided URL.

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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