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

Static analysis result for SHA-256 5c40ceef86f84daf…

MALICIOUS

Office (OOXML) / .XLSX

642.3 KB Created: 2023-08-03 11:34:29 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2024-08-06
MD5: 4590b84efcac4a9804d570f575246e27 SHA-1: 82c7ebaa6f3d4e09c2bf6c2414e3664b90bb0e35 SHA-256: 5c40ceef86f84dafd5702a066833b86c7a0067b20c8daddff80ff5e1018ba033
100 Risk Score

Malware Insights

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

The XLSX file contains 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 for client execution. The presence of this anomalous object is the primary indicator of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/F7DC.TG3 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
93a46b6599d8158df1975bc18aa17e360b2db625bbe839b737d7a617be7c5ad9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/F7DC.TG3 946176 bytes
ooxml_oleobject_00_ole10native_00.bin
cc3ffb590e1354132c047f5b51e71d1979f7478f57f5634c94850349d033d53b		 ole-package OOXML xl/embeddings/F7DC.TG3 Ole10Native stream: Ole10NATiVE 936289 bytes

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