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

Static analysis result for SHA-256 75e39cba6e63aa2b…

MALICIOUS

Office (OOXML) / .XLSX

2.91 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 49055599486b9adce786872f30018dd9 SHA-1: 8488644ebe9a00a613f34b7fbdc46aded288164d SHA-256: 75e39cba6e63aa2bace210d677dce50804b52402b0b9fbfc16cc9a748a9c96bb
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a malicious Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. This exploit is designed to execute a payload directly on the victim's machine, bypassing normal application controls. The high entropy and anomalous stream size within the Equation Editor object strongly indicate the presence of malicious code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ehLY6om.c7eNrSi 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
5f37089301c3fb68d41c9867ef1ad6f9954e3c4b77d5fe29e2642fceef995b36		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ehLY6om.c7eNrSi 2963968 bytes
ooxml_oleobject_00_ole10native_00.bin
b425f1e9e5ca00f3f4cb03bdf622a13196374ebb3c72d9c5c4f0296f6bd4cc41		 ole-package OOXML xl/embeddings/ehLY6om.c7eNrSi Ole10Native stream: Ole10natIVe 2938045 bytes

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