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

Static analysis result for SHA-256 71ab434b6a238f28…

MALICIOUS

Office (OOXML) / .XLSX

3.21 MB Created: 2025-10-08 01:54:00 UTC Authoring application: Microsoft Excel 12.0000
MD5: f8fa3075cbab2c6b8f4b07d6e2a1800c SHA-1: 415619a48ca127b7da9700786808567495b0fe5f SHA-256: 71ab434b6a238f283cfaafaca25f5a91184cec44c0cbc8cde7ed17ec05d47a71
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. No further details on the payload or specific exploit are available from the static analysis.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/luCH.dlf 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
93dc2deff7d921965fe70ead485233a1b8a25c926e73e336410f08d268a215a4		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/luCH.dlf 2897408 bytes

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