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

Static analysis result for SHA-256 18994828db857c4a…

MALICIOUS

Office (OOXML) / .XLSX

2.76 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2026-01-28
MD5: be47d857d8fe1ed08d4c53ab601c4731 SHA-1: 7248a346fca64ef023a5db75ef014a49ccbd60ad SHA-256: 18994828db857c4a991068979f9e8a8f04973b75442809c578a4ab97c317ec55
60 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel document containing an embedded OLE object identified as an Equation Editor. This is a common technique used to exploit vulnerabilities in the Equation Editor component, leading to 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/rgFMoZ.JjhqA1 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
b05bf22c30e1b9dc24d006c739a6e841107db38bb2d4efe5b05e6e3c60ab5075		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rgFMoZ.JjhqA1 2747392 bytes

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