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

Static analysis result for SHA-256 8a7ea642f7eb3851…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: bd42b1ee4310e66d25c22579f34196bd SHA-1: 2f7f339d19b7b3218bd8af46f7514e0d8fe3c7a7 SHA-256: 8a7ea642f7eb3851273f9678489bbe48a7d32bf5ca47a1d306ed94a8ef54e48a
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 file is designed to execute code upon opening. The macro sheet contains calls to functions like CALL EXEC, which are indicative of macro execution. The document body contains URLs that are likely used to download a secondary payload. The specific functions and strings suggest a downloader or droppper functionality.

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