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

Static analysis result for SHA-256 ee493bff9c4b01de…

MALICIOUS

Office (OOXML) / .XLSX

621.2 KB Created: 2022-08-10 18:51:50 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: 45204fc14046d9704f34d552b544be53 SHA-1: 4c5ed485b3a0901251e68cc018d8ee9b3b07751c SHA-256: ee493bff9c4b01deafb102ffb831ae61f78f4e74ea650a702d89fe61b4304897
100 Risk Score

Malware Insights

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

The file is an Excel document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. 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. The presence of this anomalous object strongly points to an attack pattern leveraging the Equation Editor for malicious payload delivery.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/BqCntA.R6FvL 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
5582a36e324f532cee5c61d3048a4c71b21706939e872f8fe86ab01f91210c36		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/BqCntA.R6FvL 897536 bytes
ooxml_oleobject_00_ole10native_00.bin
0e8a2fa54403974704ac71ba62851cd2c754b9e0961ae90ce57ad5bd7a9135f3		 ole-package OOXML xl/embeddings/BqCntA.R6FvL Ole10Native stream: OLe10nAtiVE 887866 bytes

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