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

Static analysis result for SHA-256 98d3e6138213aaf6…

MALICIOUS

Office (OOXML) / .XLSX

2.88 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: a0ef940b8c6cd88a8b684625016debe6 SHA-1: dacc3d25e81c9af4366692f9f2d25f6e4fbba1c6 SHA-256: 98d3e6138213aaf6f3a733fac169ca190996c2b2936de70d3492a188c78ce3d1
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The primary heuristic firing indicates the presence of an embedded OLE object, further specified as an Equation Editor object. This is a common technique used to exploit vulnerabilities in Microsoft Office applications, often leading to the execution of arbitrary code. The embedded object's path is noted as an IOC.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/2dYznzoer.LulY 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
5d54f643acf992f203145813f13bc65254477d8d998b7a6d63477f6720cbe7b1		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/2dYznzoer.LulY 2998272 bytes
ooxml_oleobject_00_ole10native_00.bin
5124ceb057fa36600df6e188b0a81e5efac37073344302d304600161db42ebf5		 ole-package OOXML xl/embeddings/2dYznzoer.LulY Ole10Native stream: oLe10natIVe 2972177 bytes

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