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

Static analysis result for SHA-256 b08440ebbb31b974…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a0aee4da874d43c59894b13133c4a784 SHA-1: 8e17b3b42d288555dfa2275c94d31fef9f974ff0 SHA-256: b08440ebbb31b97497bdff23e4af06c9b588a8b5bb2171e36f983ca103295247
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 an Excel 4.0 macro with dangerous functions, specifically `RUN` and `CALL` (implied by `risky-formula=5`), indicates an attempt to execute arbitrary code. The `ShellExecute` API reference further supports this. The macro likely downloads a second-stage payload from the embedded URL `https://tured.net/ds/261120.gif`. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' suggests 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://tured.net/ds/261120.gif
    • https://tured.net/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
4805caad40efa88359221773489543a181039fb59e7111454d99230bce3bd306		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6674 bytes

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