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

Static analysis result for SHA-256 82b9ae10b8b67e81…

MALICIOUS

Office (OOXML) / .XLSX

2.34 MB Created: 2025-09-04 00:14:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: 4d7b28f6a99c58d81fd6963de43b5d07 SHA-1: 841dba7af6e8547c1b8452bd7012485577c1e593 SHA-256: 82b9ae10b8b67e81b8b2db9a3bbb5bf49c35bad265da3a2ad367442e4f5aaddd
80 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The sample is an OOXML file containing an embedded OLE object, specifically identified as an Equation Editor object. The document also contains a lure to enable macros, indicating it is likely a dropper. No scripts were extracted, and the embedded object's content could not be analyzed further, limiting the ability to identify a specific family or detailed execution flow.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/H8EqTaxc.BNAq8w 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
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
c7b187739104cc200c028e0c8950164eadf5ed4a9cc0afe06846f1fd459df2aa		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/H8EqTaxc.BNAq8w 3019776 bytes

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