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

Static analysis result for SHA-256 792b915f3684861a…

MALICIOUS

Office (OOXML) / .XLSX

1.99 MB Created: 2025-05-16 16:28:58 UTC Authoring application: Microsoft Excel 12.0000
MD5: ad73eda94d240bd64aaff29ab6b84a0f SHA-1: 65ce9b947d5a95d0fdb0c15527fefeba908fa0fc SHA-256: 792b915f3684861a7167b1c3c46aed3f03c9f17c96ce3314a64e9f2189335b6e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. The embedded object's filename is noted as an IOC.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fee1CSI4F.ckRnNv contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • 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
768089a1ceac41e36f61965c7393571f6d6ccddb7d55f914d47b8bc51de19115		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fee1CSI4F.ckRnNv 2806272 bytes

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