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

Static analysis result for SHA-256 4d990afa4e840170…

MALICIOUS

Office (OLE) / .XLS

85.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: c27ed38d8e454d303dd00930be535686 SHA-1: f7d0693a62f0d2b4f0ba2beca38abf660b9439e8 SHA-256: 4d990afa4e8401703a3ed6bff921b5c5ce24ff0193cfa5e3b457c30f21d0a6ea
80 Risk Score

Malware Insights

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

The file is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains a lure to enable macros, a common technique for malware droppers. The XLM macro sheet uses dangerous formula APIs, specifically 'RUN', which is highly suspicious. The macro likely downloads and executes a second-stage payload from the embedded URL http://vyw27lfrvoj02kkxo.com/fedara.Z. The document body text is fragmented and does not provide further context.

Heuristics 4

  • 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.
  • 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://vyw27lfrvoj02kkxo.com/fedara.Z

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
0293713934f5b7d32c8166c4854e73496a808c04af89bdf0cde6a586b9e1d9ba
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2099 bytes