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

Static analysis result for SHA-256 9c366eb86f17c2bb…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e7f6aeea79e8e483fffec03e5bacbd02 SHA-1: c7ab6d064f5cb8395cf0d626d0a2df401dd4b0c6 SHA-256: 9c366eb86f17c2bb74178ab132c0ac63777c0a886db6d31f55ae7c0dc08500bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. This macro is designed to execute arbitrary commands, likely to download and run a second-stage payload from the provided URL. The presence of ShellExecute API calls further supports the execution of external code. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' also indicates a 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://binbios.com/ds/261120.gif
    • https://binbios.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
db00faaaa5dfbd9a76904fe95aa20bad9a05f6214a6081cc43218c3c9509e31c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6676 bytes

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