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

Static analysis result for SHA-256 bd9e6b61b7487f11…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2c0182300fb01113185ed0e54c5a06c5 SHA-1: 784b497c194b6e4e52577aa1cc249e1da740fdfb SHA-256: bd9e6b61b7487f1145b3a5e07aa7c47315d27f0a94e869ecff9577c804cd9449
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell

The sample contains Excel 4.0 macros, specifically an Auto_Open macro that uses dangerous functions like RUN. This indicates an attempt to execute arbitrary code. The presence of ShellExecute API calls further supports this, suggesting the macro is designed to download and execute a second-stage payload from the provided URL. The ClamAV detection name 'Doc.Downloader' also aligns with this observed behavior.

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://5gict.com/ds/261120.gif
    • https://5gict.com/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
a172d04deb874bfc5428cadf9fe508e67386f425fa8a97e12d80c959c827f2d9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6674 bytes

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