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

Static analysis result for SHA-256 a3685c0013999339…

MALICIOUS

Office (OOXML) / .XLSX

2.39 MB Created: 2025-10-29 06:20:05 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-06-13
MD5: d7151cf2b3c0e14dd9a7699bb58c7625 SHA-1: 82d91bfb1ec3f690d25ad32fc8ad35f60b2a8fc4 SHA-256: a3685c001399933953e6d0b0420109d45a58719ad3756cd802c7411df0c3e569
100 Risk Score

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/emaL.vb8jZ 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/emaL.vb8jZ 2855424 bytes
SHA-256: 71d1b9b5276c6ac94a858a5805c14b28f405f3478cff2ce1d4ca20420d0641f8
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/emaL.vb8jZ Ole10Native stream: OLe10NatIVE 2830558 bytes
SHA-256: 6e3264f361c6d35a147034a94056f400766d001caa3a3e8ab11c46e38d41c5bd

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