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

Static analysis result for SHA-256 650eb12a21a9ab6b…

MALICIOUS

Office (OLE) / .XLS

231.5 KB Created: 1997-03-10 02:24:35 Authoring application: Microsoft Excel
MD5: 400e6efd2c77e645e0dc39c2982ddf56 SHA-1: 5a4fb6824785616c9579c40a76ce0a899bcbe747 SHA-256: 650eb12a21a9ab6b9a3063f366e59066f12040cad0ff5967b028d9c199abc955
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file is an Excel 4.0 macro-enabled workbook that contains an Auto_Open entry. Heuristics indicate the use of dangerous formula APIs like RUN, suggesting the macro is designed to execute arbitrary code. The presence of an embedded URL, though benign, and the general nature of Auto_Open macros point towards a downloader or initial execution stage for further malicious activity.

Heuristics 5

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5c9deb03cb012157cfd01c5e984d9a693922c639d8a1d3c7400a494eef794660		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 151481 bytes

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