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

Static analysis result for SHA-256 74dd5df1dac36bb3…

MALICIOUS

Office (OOXML) / .XLSX

717.3 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-10-26
MD5: 38f6b4d5804de785b925eb46ddd86d6f SHA-1: 395f786cc490c2ca6611329ee7afbc0ad4f78997 SHA-256: 74dd5df1dac36bb348452e5d084f1a10c692e1bad2b1491cc41c2980a002d8af
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, suggesting it's designed to exploit a vulnerability. This points to an attack pattern focused on exploiting the Equation Editor component for initial execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/TImLoKnHF.uUGq7 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
37962ecb3c7b13176e703971cbe70847f775b48dfd5a341088b2e5aa2c7f56fd		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/TImLoKnHF.uUGq7 1019904 bytes
ooxml_oleobject_00_ole10native_00.bin
0a1e8d040aa4798d075d9b0de203ca04193dc3b3497c87043c91f4263a9e87a7		 ole-package OOXML xl/embeddings/TImLoKnHF.uUGq7 Ole10Native stream: oLE10NAtIVe 1009477 bytes

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