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

Static analysis result for SHA-256 14c3d564746b6758…

MALICIOUS

Office (OOXML) / .XLSX

720.8 KB Created: 2024-03-25 10:30:17 UTC Authoring application: Microsoft Excel 12.0000
MD5: 35b1e22aa56e40ead957cfa701047c9a SHA-1: e1aeba5e2da8787cec1e2923daf24267a8fa0627 SHA-256: 14c3d564746b675894f28be647660a61f849cb460a697acd0fa48f9494462e0e
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

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 size difference, strongly suggesting exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/wF6BBom.0DE 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
f7a0900876b35a253035fc2dace25241a1b2aaa8f16d8d3f39811693f53ba018		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/wF6BBom.0DE 992768 bytes
ooxml_oleobject_00_ole10native_00.bin
57bf73da3463c11cae7b6d19f70c33f881c4c6b768b3221a06e019ec7b40d226		 ole-package OOXML xl/embeddings/wF6BBom.0DE Ole10Native stream: Ole10NaTIVE 982201 bytes

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