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

Static analysis result for SHA-256 af289f26a9b23e68…

MALICIOUS

Office (OOXML) / .XLSX

2.00 MB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-06-08
MD5: 31d0a0b780d4332d019ae1e0269c5ca8 SHA-1: d4059234a0af8ab1a877d4b0f220c85f89d567c6 SHA-256: af289f26a9b23e6863bc66e473fb81f07f566f029b360bef89e45cce8f0d9518
100 Risk Score

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/UPH.xcv 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/UPH.xcv 2857984 bytes
SHA-256: 4d9a526958e0ae1608f9e7962a5ff19fdcf0d380742a57ecc5afedc195b9ead4
ooxml_oleobject_00_ole10native_00.bin ole-package OOXML xl/embeddings/UPH.xcv Ole10Native stream: oLE10natIVe 2832903 bytes
SHA-256: a497b563c28e62d66c034a7f874a544b636f0f51e16049b16a030695e106f70e

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