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

Static analysis result for SHA-256 96ee23087faf2dcb…

MALICIOUS

Office (OOXML) / .XLSX

2.82 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-10-20
MD5: 6b6412b34339f080bb87cf17b3776b91 SHA-1: c0e8a7eaaa7708eeaad6ef3bec99af86c3dbb08f SHA-256: 96ee23087faf2dcb6211c615616a6d3ef7129f1da7266989345bd569fd9bbf5d
100 Risk Score

Malware Insights

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

The sample is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object contains a payload-like Ole10Native stream with an anomalous header, suggesting it is being used to exploit a vulnerability. 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/18IELoc.IB6T8I6 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
1df8741e36124808fa04e0f847241024bbce0dc7c0caaa5d90f726f9c3c487f4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/18IELoc.IB6T8I6 2912256 bytes
ooxml_oleobject_00_ole10native_00.bin
3c4debee00980fd420e0b33d8364b5116f229cda1230182d9e9960152a3c5a09		 ole-package OOXML xl/embeddings/18IELoc.IB6T8I6 Ole10Native stream: oLe10naTIvE 2886985 bytes

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