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

Static analysis result for SHA-256 66c44453e644ddba…

MALICIOUS

Office (OOXML) / .XLSX

2.95 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2026-06-15
MD5: abadf018b137b8c8815c040eb3464fdc SHA-1: d7420fb77786fc3eb641f7f8f6498b67a382f954 SHA-256: 66c44453e644ddbab16bf2295f40adcf95084abe36983bdc6e914ab2927a095d
100 Risk Score

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UWgehPk.Vhv3n 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/UWgehPk.Vhv3n 3072512 bytes
SHA-256: cb60d4a74055a0f6106137e9793606939151761481489789ab4d6fe7a5044f7e
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/UWgehPk.Vhv3n Ole10Native stream: OLE10natIVe 3046335 bytes
SHA-256: 08733e9fa6c650c9743d6a6ea55b65cdac96095531795bd81d6b530db307c9f7

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