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

Static analysis result for SHA-256 1bc14ba071330c5e…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: fb7a5cff554073c6688ff45e9ae637d1 SHA-1: f25868c8889ce386d0774ae8fe828920565e9a25 SHA-256: 1bc14ba071330c5e1a1778b4f21a94a79cb2cd2acab4f31de1a04003bec3bd41
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 and ShellExecute. This indicates the macro is designed to execute arbitrary commands. The presence of embedded URLs suggests the macro's primary purpose is to download and execute a second-stage payload, likely a downloader or dropper. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' 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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