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

Static analysis result for SHA-256 5e47826526fb6a74…

MALICIOUS

Office (OOXML) / .XLSX

2.89 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 2aa3b0fbd06d8b8b1550f34c2878f173 SHA-1: f5c3386174217fe5575e89ce6f607456223bc9b0 SHA-256: 5e47826526fb6a74c93d6463e00fce1bbcea30f08c57456f6012f52f036c9712
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is designed to exploit a vulnerability for client execution. The anomaly in the Ole10Native stream size and header further supports this conclusion.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/WWAXqInxs.rybV 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
728452b32ffae7620d9eeb66e2874a45538240bc994226607a79031bcfb85429		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/WWAXqInxs.rybV 2977280 bytes
ooxml_oleobject_00_ole10native_00.bin
ed496d31dc7e00c5da9c2b1fa7669a668294e45bb90de4486783e17ebf8b78c8		 ole-package OOXML xl/embeddings/WWAXqInxs.rybV Ole10Native stream: oLE10NAtIVE 2951600 bytes

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