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

Static analysis result for SHA-256 2e9fbb758403987b…

MALICIOUS

Office (OOXML) / .XLSX

2.86 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: ee4cc080be20bdcbc12c5a95a93011e3 SHA-1: 8460f99735c6c27c4f26d60e06d8f4d900e55316 SHA-256: 2e9fbb758403987b6e5b83409e7525dabeedc8eab304b149ad9ba02e073acf07
60 Risk Score

Malware Insights

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

The file is an OOXML document containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. The embedded object's filename is noted as an indicator.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/425XyE.sHhe contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
5cbac8cedc26d52e13ed01793ceac98795929c6b804f08fbe920414e2a4a5028		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/425XyE.sHhe 2909696 bytes
ooxml_oleobject_00_ole10native_00.bin
23fe3cd6931b515c3674a386e517373f0aef9a3ae5958ed457bdeb2ebc5817c1		 ole-package OOXML xl/embeddings/425XyE.sHhe Ole10Native stream: oLe10natIVe 2884588 bytes

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