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

Static analysis result for SHA-256 865c1c6539562a29…

MALICIOUS

Office (OLE) / .XLS

332.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 2abdebb0c860d6cf131fac38cfafa28a SHA-1: 7482627fbfea4066472a57adb7c0227e007e1c2b SHA-256: 865c1c6539562a292e1fd32ea7bcba77faf080ad6db4e6d08238dfeb1e8d662c
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 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 ShellExecute API calls further supports this, suggesting the macro attempts to download and execute a second-stage payload from the embedded URL. The ClamAV detection name 'Doc.Downloader.Docusign0521-9864805-0' also points to a 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://dtmh.gr/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
7a95a7cce68030733d0896cac3e2e38949cccca6e5f11b7d9654f626186187a8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6294 bytes

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