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

Static analysis result for SHA-256 c2a6406839cb8886…

MALICIOUS

Office (OOXML) / .XLSX

2.91 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-10-29
MD5: 4c9d39827373d29f097568eb1dce7170 SHA-1: 3e89089030d6c0286f9d99940c908d3dc469627c SHA-256: c2a6406839cb888637da186b38475b92bb6e5f3944c0133490b382448177bd70
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size difference, strongly suggesting exploitation of a vulnerability within the Equation Editor component. This is a common delivery mechanism for malware.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/d4neUVkO.tb67Ae 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
22c9e222309e0a1b045331a5019b10851dfcce236a65a61247292fd10901ac2b		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/d4neUVkO.tb67Ae 2999296 bytes
ooxml_oleobject_00_ole10native_00.bin
502870dd23445c761ea03d4a59047777f069ed8bd07d8b86cdfdc310e9b9b8b3		 ole-package OOXML xl/embeddings/d4neUVkO.tb67Ae Ole10Native stream: Ole10nATIVe 2973644 bytes

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