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

Static analysis result for SHA-256 c439f1a6bfff986b…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 684eb413e55fd5d29ca8457d144ed276 SHA-1: 387961f6dcb6342c57cf8e1e93a12186ebaf29b7 SHA-256: c439f1a6bfff986bb09afc0465c1d16e5a50b777c66b043dfa491a6fdaed2b0f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1204.002 Malicious File

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and potentially ShellExecute. This indicates the macro is designed to execute arbitrary commands. The embedded URL likely serves as a distribution point for a second-stage payload, as suggested by the ClamAV detection name 'Doc.Downloader'. The presence of the DocuSign string in the document body might be a lure to trick users into opening the malicious file.

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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