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

Static analysis result for SHA-256 9541f5127d317f72…

MALICIOUS

Office (OOXML) / .XLSX

2.80 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-09-25
MD5: 76686894cc28027fb8b352b63117d466 SHA-1: ebd90aff57b76df5cc96d8a2094853827e1dcf9e SHA-256: 9541f5127d317f723900fd412a4dd9334d81b10f57fd3763da0d85f11c92cfb9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The XLSX file contains 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 and an impossible declared inner size, strongly suggesting it's used to deliver a secondary exploit or payload. No VBA macros or document body text were extracted, but the presence of the malicious Equation Editor object is sufficient evidence of exploitation.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/qhZ.1Hja 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
e347ec7e302892f952bc991794962e3015a36f3d88dce92eae9ce332567e2b91		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/qhZ.1Hja 2890752 bytes
ooxml_oleobject_00_ole10native_00.bin
8017331741ccd565e93461c3256455f4e42da50516290e9ed57ae7955ae597d0		 ole-package OOXML xl/embeddings/qhZ.1Hja Ole10Native stream: oLE10nATIVE 2865593 bytes

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