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

Static analysis result for SHA-256 5c425ce159c48d39…

MALICIOUS

Office (OOXML) / .XLSX

2.15 MB Created: 2025-07-23 07:56:53 UTC Authoring application: Microsoft Excel 12.0000
MD5: ded56d815d7c83de5f7102bb60b4f10c SHA-1: ac211431abd6b5807f67123abde7aa7437dd64c1 SHA-256: 5c425ce159c48d397bf4c93832fe944867a56b10f5d820bc251a5aafb62518c7
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an XLSX file containing an embedded OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the document is opened. No specific family could be identified, and no further IOCs were extracted.

Heuristics 3

  • CVE-2017-11882 — Equation Editor FONT record overflow critical CVE likely CVE_2017_11882
    Equation Editor MTEF contains an overlong FONT typeface field, the vulnerable copy primitive for CVE-2017-11882. This is stronger evidence than the Equation Editor CLSID alone because it identifies the malformed record that drives code execution in EQNEDT32.EXE.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Wb33grM.v3FKo 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
1c21642a1767f139fc4c926244cecd501370ba751422ddc9a8ca1f9427322914		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Wb33grM.v3FKo 3017216 bytes

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