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

Static analysis result for SHA-256 7e47c6a9502e1608…

MALICIOUS

Office (OOXML) / .XLSX

2.81 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: d681f8ea578f857c36983a5a66285f2e SHA-1: 019244280632b43b1e7d81711005881907b92f16 SHA-256: 7e47c6a9502e1608db9a06683851a59ce891d0e1ba4430f060d645e6280c3608
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 an Equation Editor exploit. This exploit is designed to execute a payload, indicated by the OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY heuristic firing. The presence of the Equation Editor OLE object and the anomalous Ole10Native stream strongly suggest exploitation for client execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ln.7Qzas 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
4d3a333769fac6b838569e3af4f1a01f01d327301b48a594d2ad8762f10c933d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ln.7Qzas 2824704 bytes
ooxml_oleobject_00_ole10native_00.bin
9314664ff783853cc0054394acbf52a754633fe5b85a45bba28c7a8626e0c769		 ole-package OOXML xl/embeddings/ln.7Qzas Ole10Native stream: OLE10nAtIve 2799656 bytes

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