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

Static analysis result for SHA-256 d71ab229f49fad41…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: 0b6536b0e05f1a19d7ce250841690ebb SHA-1: 7ac60c74c40aed42095b73af6ebc24970afccfff SHA-256: d71ab229f49fad4156e74f4c9ceea9a4e70931c62949802a8d0963230aeba2ae
62 Risk Score

Malware Insights

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

The presence of an Excel 4.0 macro sheet (OLE_XLM_AUTOOPEN) indicates the potential for malicious execution. The macro sheet contains strings that appear to be part of a command to download a file from the URLs 'actualitatea-crestina.ro/vAaimKTJbZgA/ork.html' and 'baro-care.de/AcQy6YJYOdr/ork.html'. The macro also includes commands like 'EXEC' and 'LDo', suggesting an attempt to execute a downloaded payload.

Heuristics 3

  • Excel 4.0 (XLM) macro sheet uses dangerous capability functions high OLE_XLM_DANGEROUS_FN_STATIC
    Workbook contains an Excel 4.0 macro sheet whose formulas reference two or more dangerous capability functions (e.g. CALL into a Win32 API such as URLDownloadToFile, EXEC to launch a process, REGISTER an external DLL procedure, or FWRITE/FOPEN to drop a file) with an Auto_Open / Auto_Close auto-execution name. This is the canonical XLM downloader/dropper shape and is recovered directly from the BIFF records, so it fires even when the full macro chain cannot be deobfuscated.
  • 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://actualitatea-crestina.ro/vAaimKTJbZgA/ork.html Referenced by macro
    • https://baro-care.de/AcQy6YJYOdr/ork.htmlReferenced by macro

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