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

Static analysis result for SHA-256 939cac35951197bb…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 994a1c52bc1a82f2ee7c8bc1d8f0473c SHA-1: 7b1ef97eb7229e6b89ad18840333367dac4a3fb3 SHA-256: 939cac35951197bb1da8f4aa97e5734ecc1e6d782be17ae95357655c9b9216a9
160 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open function that utilizes dangerous APIs like RUN. This indicates the macro is designed to execute arbitrary commands. The presence of embedded URLs suggests the macro's purpose is to download and execute a second-stage payload. The ClamAV detection name 'Doc.Downloader' further supports this conclusion.

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://fcco1936.com/ds/231120.gif
    • http://fcco1936.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
1df732b478dcf2e8e2d7a8e9f6d49c0e62fe9c357edaf30cf32b9f7c844e5e47		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6297 bytes

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