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

Static analysis result for SHA-256 610d2a72f1a34553…

MALICIOUS

Office (OLE) / .XLSX

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: bdfea2b00c0499097561e703491ccdf5 SHA-1: 7450a0d01f4638c54d94378b5c5e322778b5ebf3 SHA-256: 610d2a72f1a345532a33f72f5e658e1e244b916810542a766c975a19fca4f96f
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 a macro-based execution attempt. The macro sheet contains calls to functions like 'CALL EXEC' and 'LoadT', strongly suggesting it is designed to download and execute a second-stage payload from the URLs 'dharamdiwan.in/njipkUcz/ork.html' and 'unlenoirramosjr.com/7r9JyFLo/ork.html'. The embedded file paths '\iroto.tio' and '\bubl.cmi' are likely related to the dropped 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://dharamdiwan.in/njipkUcz/ork.html Referenced by macro
    • https://lenoirramosjr.com/7r9JyFLo/ork.htmlReferenced by macro