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

Static analysis result for SHA-256 2dcf10577feacf3b…

MALICIOUS

Office (OOXML) / .XLSX

2.82 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 71bd4f310498455f5d30620a68478c5c SHA-1: 951a0ca3af5d6f2aa8b4658c0336c9ac904e5170 SHA-256: 2dcf10577feacf3ba5270310503dc3ad6472679a5e8fc6d87f5fc757015046ee
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Office (OOXML) XLSX file identified as malicious. Static analysis detected a high-severity heuristic for an Equation Editor OLE object embedded within the document. This object, located at xl/embeddings/DkJL.r7fTRG, is a known vector for exploiting vulnerabilities to execute arbitrary code. The presence of this embedded object strongly suggests an attempt to leverage an Equation Editor vulnerability for initial compromise.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/DkJL.r7fTRG 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
f02981439571daf9076c796c0826dd93d6c1da4664a60c6d682921a94d598282		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/DkJL.r7fTRG 2825216 bytes
ooxml_oleobject_00_ole10native_00.bin
97426cbe31b62915c04de18a98292dbf024413df1d5a835bae830b49b9a85756		 ole-package OOXML xl/embeddings/DkJL.r7fTRG Ole10Native stream: olE10NaTiVe 2800492 bytes

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