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

Static analysis result for SHA-256 9cc3a43497044ad8…

MALICIOUS

Office (OOXML) / .XLSX

9.0 KB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: ec80cb40c6c4280349f3773d25e2e2fd SHA-1: e512f6f08f275b6260b53b801e4c7710f7b42102 SHA-256: 9cc3a43497044ad88e424b82ffb0801a4c9e3033c34ddd32fe282c996ca545bc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate a high likelihood of exploitation for CVE-2018-0798 due to anomalous native stream data within the Equation Editor object. This suggests the file is designed to exploit this vulnerability to achieve arbitrary code execution.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/oleObject1.bin contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • CVE-2018-0798 — anomalous Equation Editor native stream high CVE likely CVE_2018_0798_EQUATION_NATIVE_ANOMALY
    Embedded Equation Editor OLE data contains anomalous native stream bytes consistent with a CVE-2018-0798-style Equation Editor exploit. This is treated as likely CVE evidence because the Equation object is malformed and payload-like, but it does not match the exact public matrix-overflow byte signature.
  • 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
30a73742a8b22591ce36065ba16a0a2710dc63e2fdad0cd035093bb662a88ab2		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
ooxml_oleobject_00_ole10native_00.bin
565e7c041b9c291b1885b821027a3a5003cb1c8d0016fd921fdbfe4188f32d78		 ole-package OOXML xl/embeddings/oleObject1.bin Ole10Native stream: oLE10NaTivE 1872 bytes

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