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

Static analysis result for SHA-256 f2c3bb261628e7cd…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f710774f271b2c0662a0e6f16d24f46f SHA-1: 1d2b4a086f7cfe3f0c9a978f1f39b54dad738cc7 SHA-256: f2c3bb261628e7cdf01ca0700f790c0bc5123cfa0158dc5ab3e938e81d24db38
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 ShellExecute. This indicates the macro is designed to run external commands, a common technique for downloading and executing further malicious content. The embedded URL is likely the source for this secondary payload. The ClamAV detection name 'Doc.Downloader' further supports this downloader functionality.

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://kenas888.com/ds/231120.gif
    • https://kenas888.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
6dd2ce04afad0a05495adb4f6301aeb41dcc78e9673b9399eb28871054a28e1a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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