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

Static analysis result for SHA-256 768ef30b335f6ebd…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: ca9afc635f3c2936b2e0c7dacece5d04 SHA-1: a98670e9654d3bd860040a51ca98f329c99afa30 SHA-256: 768ef30b335f6ebd958eeb3f1d16462082ee632cf6eb367d8e2760492a0d6a4d
62 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros (XLM) is a strong indicator of malicious intent, despite the clean verdict. The macros contain calls to 'EXEC' and 'LoadTFile', suggesting an attempt to download and execute a second-stage payload. The URLs 'fan00s.com/ONiFJdjU4uv9/key.html' and 'radiovirsa.com/ZepSxiqM/key.html' are likely sources for this payload. The string 'Server' is also present, potentially 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://9RV.GK/HLO Referenced by macro
    • https://fan00s.com/ONiFJdjU4uv9/key.htmlReferenced by macro
    • https://radiovirsa.com/ZepSxiqM/key.htmlReferenced by macro