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

Static analysis result for SHA-256 de2611afe2c3174d…

MALICIOUS

Office (OOXML) / .XLSX

16.4 KB Created: 2025-05-22 22:02:38 UTC Authoring application: Microsoft Excel 12.0000
MD5: 6bc1b91fbf166296afa1629db3448f25 SHA-1: 0cc016fcc71a7e157c9906640e76b474cb700bb5 SHA-256: de2611afe2c3174d39d22e1ebbf023ee54648910977cf7da511a137cb0bb07fc
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file is an Office document containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate the presence of CVE-2018-0798, an anomaly within the Equation Editor's native stream, which is a known exploit vector. This suggests the document is designed to leverage this vulnerability for initial 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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
2708daf5e9585d4f6108c54c57ee3b0b28b3ad4011bae451653c3381521416c9		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 3584 bytes

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