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

Static analysis result for SHA-256 f1b439e23f0bd7ab…

MALICIOUS

Office (OOXML) / .XLSX

2.92 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 5d2bb3cd60e97577806fa96fa34fb4ce SHA-1: 8c3b9deb3c368d550cfab46776809180b0d4e373 SHA-256: f1b439e23f0bd7ab251987a7e48b93c54fc71b69ba7cd744c51682daaddf29da
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The primary finding is a high-severity heuristic indicating an Equation Editor OLE object embedded within the XLSX file. This is a common technique used to exploit vulnerabilities in Microsoft Office applications, often leading to the execution of arbitrary code. The embedded object is large, suggesting it may contain a secondary payload. No document body or scripts were extracted for further analysis.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mcCtR5f.tLFQC9s 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
3d2144669383d0a36888fbcebc0b0228baeb894dba21e1292f983cb205e7cce5		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mcCtR5f.tLFQC9s 2996736 bytes
ooxml_oleobject_00_ole10native_00.bin
08c5886bd70f7895bbb02173ae8203958115b8a62a7b23aaa0ce66e4ca9015a1		 ole-package OOXML xl/embeddings/mcCtR5f.tLFQC9s Ole10Native stream: OlE10natIve 2970627 bytes

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