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

Static analysis result for SHA-256 302a4a3f3a6432d1…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 6c8e4a6745203346b758ab1d6b43e6d4 SHA-1: e848f6c20322481e4257a2867ec5f24a2e336a14 SHA-256: 302a4a3f3a6432d1f853c14efb7160d9ac9811533d75ff719b3387c314fcf395
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 sample is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, including ShellExecute and RUN, to download a payload from the provided URL. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' further suggests a downloader functionality. The embedded URL is highly suspicious and likely serves as the distribution point for the second-stage malware.

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 http://panzr.tech/ds/231120.gif
    • http://panzr.tech/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
c8b1e7a8344e098ddc3906ba00141dccfa02d07406793ff05618684390276899		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6057 bytes

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