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

Static analysis result for SHA-256 3889272af2ed74b3…

MALICIOUS

Office (OLE) / .XLS

644.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2021-05-29
MD5: 986decb72a1aaa604cd4ae3d5d815c95 SHA-1: e9e4b2c45fe23f0a7f9468043ed2dd310786b29a SHA-256: 3889272af2ed74b3b229a6a0d6025d3a9e96cd5f486f802cfe618c047181c7d7
62 Risk Score

Malware Insights

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

The presence of Excel 4.0 macros (OLE_XLM_AUTOOPEN) indicates a macro-based attack. The macros contain calls to functions like 'LoadT', 'Fil', 'LDo', 'dll', 'Regi', and 'ster', along with URLs, suggesting an attempt to download and execute a second-stage payload. The reconstructed strings 'CALL' and 'EXEC' further support this. The specific URLs indicate the potential source of the malicious 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