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

Static analysis result for SHA-256 c77ca355e82767f9…

MALICIOUS

Office (OOXML) / .XLSX

2.10 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: 9431c1a02004fac95904077524ce2bb2 SHA-1: c4cf715d94118a58863e4384cb1cc04963350a0e SHA-256: c77ca355e82767f9aa20725cdd3aa6a3be0fdc3e31c0f05f9026c7292b8154f4
60 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 an Equation Editor object. This strongly suggests exploitation of a known vulnerability within the Equation Editor component to achieve arbitrary code execution. No further details on payload or specific exploit chain were available from static analysis.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/9v68n.lhl 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
65af45c662a6fd391496654351ff09141a2b6d1d3dfd84e50b4fcf0f06cd496d		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/9v68n.lhl 2970112 bytes
ooxml_oleobject_00_ole10native_00.bin
7774d2d82b87a810c35b5fe6360fc483fdb2bf6e549405083786c595758af88c		 ole-package OOXML xl/embeddings/9v68n.lhl Ole10Native stream: oLe10nATIve 2944119 bytes

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