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

Static analysis result for SHA-256 64350a8c7e4476fa…

MALICIOUS

Office (OOXML) / .XLSX

650.0 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-20
MD5: 956c18a9e0f925e8004f516e6ed61bc8 SHA-1: 68b3b2e80eed38da7832a4dda848b5059971a1be SHA-256: 64350a8c7e4476fa1e432203f6cc6a4e6cfad510b622af654ed4c84266426668
100 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking T1204.002 Malicious File

The sample is an Excel file 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 deliver malicious content. The presence of this embedded object and the anomalous stream strongly indicate an exploit targeting the Equation Editor component to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1oG.GYnxC0t 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
8e0fc123bb5b7f82fdcf63a5e54e37236178155ba205dfe790743257e3e0be58		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1oG.GYnxC0t 916480 bytes
ooxml_oleobject_00_ole10native_00.bin
cd41b4cc070df502e442550ca39ee0da312b7c94b8780ab5353b2b8cd920d105		 ole-package OOXML xl/embeddings/1oG.GYnxC0t Ole10Native stream: olE10NATIVE 906953 bytes

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