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

Static analysis result for SHA-256 0b4e76735560d09d…

MALICIOUS

Office (OOXML) / .XLSX

2.09 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: a2f982fa6417146b4026ac081b7523bb SHA-1: 3b25da9cbe48927fc0fe20622be5d18aa5be7f5f SHA-256: 0b4e76735560d09d622c716ce4568ac7c1a6a93a7a2446e6ca88a41de08620d8
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 a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it is being used to exploit a known 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/KcDw.XYpE 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
8ad966f7fb478f5146c7919bbc32e8e0bd4c5e0587536eda5824b068fe518a39		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/KcDw.XYpE 2980352 bytes
ooxml_oleobject_00_ole10native_00.bin
886be5d5c2cace593c67b83b082057eb28192d40d5b4037dc9e413cbdc3d1def		 ole-package OOXML xl/embeddings/KcDw.XYpE Ole10Native stream: OLE10natIVE 2954451 bytes

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