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

Static analysis result for SHA-256 c3f3ab903ec89d46…

MALICIOUS

Office (OOXML) / .XLSX

2.04 MB Created: 2026-05-01 06:32:27 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-06-19
MD5: 1f89580843d5d05d8c0fd1dd71d53d21 SHA-1: f16f801978dd73d4f4d0021014cabbd86cc9f4c8 SHA-256: c3f3ab903ec89d4610138c0699d102a7aa8966b0334a5467b11cf76ff3f57f34
120 Risk Score

Heuristics 3

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/YLnSA.Ld contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin ooxml-ole-object OOXML embedded OLE part: xl/embeddings/YLnSA.Ld 2893312 bytes
SHA-256: 5274f60813d23744280f39398fdf9e23d98449d380bfbabdf750979c54b9e362

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