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

Static analysis result for SHA-256 ffe20d069d7860e1…

MALICIOUS

Office (OOXML) / .XLSX

2.77 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2025-12-16
MD5: 4a0698033519c0bb057201cf82dddae8 SHA-1: b2d588bb67594cceda7db714e8bfb260d918922d SHA-256: ffe20d069d7860e19a6e151597a4425d6a79bbd0a97e919e401003ee186f42d9
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The sample is an Office document containing an embedded OLE object, specifically identified as a Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's being used to exploit a vulnerability for client execution. The embedded OLE object itself is the primary indicator of compromise.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/lnjiVOe6.gP7U 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
c7d4f2de5a511f8c2c4d306e075ef9ae2b835afd1542efc5a01672c06dd0daaa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/lnjiVOe6.gP7U 2783232 bytes
ooxml_oleobject_00_ole10native_00.bin
008f57e3b0d5b5f3aca924577534087673d4947cd82186ee2699b11f8fa39603		 ole-package OOXML xl/embeddings/lnjiVOe6.gP7U Ole10Native stream: oLe10nAtive 2758852 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.