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

Static analysis result for SHA-256 a9a75a3539e237b9…

MALICIOUS

Office (OOXML) / .XLSX

148.6 KB Created: 2026-05-27 17:22:24 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2026-06-10
MD5: b80b344f0b68804cb185392533be080a SHA-1: 1a896ae5bb981136e95d5375422dbde397d6db89 SHA-256: a9a75a3539e237b9ec58a77bbe1da8821e70c606b66e7ea9c943fced7a7106ce
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML document containing an embedded OLE object. Static analysis identified a critical vulnerability, CVE-2017-11882, related to the Equation Editor component within this OLE object. This indicates the file is designed to exploit this vulnerability for client-side code execution.

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/oleObject1.bin 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 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/oleObject1.bin 4096 bytes
SHA-256: 45df2741d88d667714f73b5256fc5eb1178bc32cd9ec8660e1916874033b2baa

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