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

Static analysis result for SHA-256 4a67b69489073bce…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: 2a8091ddefcc3c06dfcfde7999bf12f2 SHA-1: abd6285d1350f187ac2b965313d405e8c08e425c SHA-256: 4a67b69489073bce4d8d3d9e115d90b06954aa35ce8721c243a51cc496d5b750
62 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications T1105 Ingress Tool Transfer

The presence of an Excel 4.0 macro sheet (XLM) indicates a potential for malicious execution. The macro sheet contains strings that appear to be URLs ('eletrofrios.com/0cgEbnyc/ork.html', 'sitka.in/rbWExNYu/ork.html') and commands ('CALL EXEC', 'LoadT', 'Server') which suggest an attempt to download and execute a second-stage payload. The reconstructed command 'Server' is likely related to the execution or registration of the downloaded file.

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://eletrofrios.com/0cgEbnyc/ork.html Referenced by macro
    • https://sitka.in/rbWExNYu/ork.htmlReferenced by macro

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