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

Static analysis result for SHA-256 bc2673a67cec8c02…

MALICIOUS

Office (OOXML) / .XLSX

2.87 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 6d9eeea820142c52028e2f078edea3c0 SHA-1: afc4ce27c1d96bc10945230da0cf28a1010c9aef SHA-256: bc2673a67cec8c02f46975aac2d02c248ce01fe7132b8c57bcd35cc41e10b547
60 Risk Score

Malware Insights

MITRE ATT&CK
T1559.001 Component Object Model Hijacking

The sample is an Excel file containing an embedded OLE object identified as an Equation Editor. This is a known method for exploiting vulnerabilities in Microsoft Office applications to execute malicious code. The presence of the Equation Editor OLE object strongly suggests an exploit delivery attempt.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Ghk.mIr 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
ea39715e45ee55045e1a74cd36174131150e6e2e2a3c8bcbf63f7f7974ca1b32		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Ghk.mIr 2928128 bytes
ooxml_oleobject_00_ole10native_00.bin
3c5e7d9fa0d628093488f31274304efd87351beceffeaa63aca51e67088e866a		 ole-package OOXML xl/embeddings/Ghk.mIr Ole10Native stream: OlE10NAtivE 2902691 bytes

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