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

Static analysis result for SHA-256 7a4ceaad6c549705…

MALICIOUS

Office (OOXML) / .XLSX

726.6 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300
MD5: b35a8e32ed24e40fb1b6fbf4fa33de12 SHA-1: 328f51a06b45affce3ebe55620b7702b33506e7b SHA-256: 7a4ceaad6c54970568515c40336569dae11da1b61cae5b8fd03785d10981f313
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like stream, suggesting it is being used to exploit a vulnerability. The presence of the Equation Editor OLE object strongly points towards exploitation for client execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/J0.uAf 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
2c349b599145f2a9dc8cd9649ccd5668127d4e1a95dbf61bee2771b88b70dbf4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/J0.uAf 989184 bytes
ooxml_oleobject_00_ole10native_00.bin
37028cd86328e6acf72d2770a344c62aa9f3db86caad2a420c941011e0f52ed6		 ole-package OOXML xl/embeddings/J0.uAf Ole10Native stream: OLE10NAtIVe 978472 bytes

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