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

Static analysis result for SHA-256 5d52751dd0b3e8eb…

MALICIOUS

Office (OOXML) / .XLSX

2.60 MB Created: 2026-02-24 00:07:14 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-02-26
MD5: a303f4243a7d71e569044a2f33acdcd2 SHA-1: 852fd3e47b0cda96a31382d77587ae1afbb19101 SHA-256: 5d52751dd0b3e8eb86f3fd8b5a851bae35bcb986688b10a61daa6571c47d881b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML document containing an embedded OLE object, specifically identified as an Equation Editor object. This indicates a likely exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wwirz4qC.DeEik 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
4e3a5c8bc2d59736802e2eb5332601b3c5fe1f6ac38c675195be1004b9d04ac3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wwirz4qC.DeEik 3111424 bytes

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