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

Static analysis result for SHA-256 c062804b11b44241…

MALICIOUS

Office (OOXML) / .XLSX

2.05 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2025-11-08
MD5: 5dca1ff147cb01875bc0472358ad15b9 SHA-1: 208e2e9418b6a8c0a9cb3a170402b1543df3674d SHA-256: c062804b11b44241e6ae694fcf958a477e0f2a7bd03283c58d08b31fbb739b67
100 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1559 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability for code execution. The anomaly in the Ole10Native stream's declared size versus its actual size further supports this. This points to an exploitation attempt, likely to download and execute a second-stage payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/G2Cz.3X4RdW9 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
66c4dfd3ef19c3c2ead8226a83bb2cab85c465e363f1b32f987758e50e204c21		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/G2Cz.3X4RdW9 2921472 bytes
ooxml_oleobject_00_ole10native_00.bin
beebe1ed0e0ebe94fde52eb663e149d6ac3580ce44d6c29112d2eef5c5c8b8ad		 ole-package OOXML xl/embeddings/G2Cz.3X4RdW9 Ole10Native stream: OLe10NatiVE 2896148 bytes

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