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

Static analysis result for SHA-256 c0a846205409e794…

MALICIOUS

Office (OOXML) / .XLSX

732.2 KB Created: 2010-06-04 08:55:28 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-10-10
MD5: cff896e6e42c979f175add2d7b0eeb7d SHA-1: 2972d50442efb2910509822622618fd157e5cdeb SHA-256: c0a846205409e794c0d74ef8df5850cd74af69606a1532e650787b10f1ca3203
100 Risk Score

Malware Insights

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

The sample is an Excel document containing an embedded OLE object, specifically identified as a Microsoft 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 exploit a vulnerability. The embedded object's structure and the anomaly strongly point towards the exploitation of a known Equation Editor vulnerability to execute arbitrary code.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/RHUaD0IM.CcxIg4 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
69d666ced49fa51c489f33587f66d1b3d7c717390234b2106685bc4a29d590cb		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/RHUaD0IM.CcxIg4 1069056 bytes
ooxml_oleobject_00_ole10native_00.bin
45c78651c65c93b54312d6562ab839773054cd1755d6b632dc57ffca1d3362db		 ole-package OOXML xl/embeddings/RHUaD0IM.CcxIg4 Ole10Native stream: olE10NaTIve 1058298 bytes

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