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

Static analysis result for SHA-256 f0c3eca487015c77…

MALICIOUS

Office (OOXML) / .XLSX

1.97 MB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-06-08
MD5: 3921a3338b0853011e3d62d9e5f12fe0 SHA-1: eb63270c4cae1ed123603125ff809baebade8d38 SHA-256: f0c3eca487015c7719ea8ceda17ae8b5dc7f19f151f01e258ec700fa36a08f0d
100 Risk Score

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/vfZ9VG.zrwzaZT contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/vfZ9VG.zrwzaZT 2763264 bytes
SHA-256: 645120b1f7e4aea9cfcfc8efb08724a3c3dbddb336698de45e5fd2b73660f5bf
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/vfZ9VG.zrwzaZT Ole10Native stream: ole10nAtIvE 2739029 bytes
SHA-256: 01a5eefd6313012f44b0702556be13bfae30cfd2b7910b94bc8f6676f8164cbe

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