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

Static analysis result for SHA-256 521ac3a0cea03af1…

MALICIOUS

Office (OOXML) / .XLSX

2.18 MB Created: 2025-08-18 05:08:49 UTC Authoring application: Microsoft Excel 12.0000
MD5: b3c2fcd5300c497e4565126a3dbc871a SHA-1: 1b4ed62be1a9bbf3a5aacd44c3eb8c5b2a7cf698 SHA-256: 521ac3a0cea03af13bf5a6fb557255ac514d69e91bb23359422e362da95272fe
60 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1559.001 Component Object Model Hijacking

The high-severity heuristic firing for an Equation Editor OLE object strongly suggests the presence of a known exploit. This type of object is frequently used to deliver malicious payloads by exploiting vulnerabilities within the Equation Editor component. The embedded OLE object is the primary indicator of compromise.

Heuristics 2

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/fIz5XQkj7.YWM 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
4126894ab30481f0279a86dddf13ccb2d873b4dd9ed8e26aa80987f35ad41db3		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/fIz5XQkj7.YWM 3038720 bytes
ooxml_oleobject_00_ole10native_00.bin
b3cb90bfc3cc284ede5dd6fdd34bdfb9043fddae7a2aec0c1e8d2a325d7fddca		 ole-package OOXML xl/embeddings/fIz5XQkj7.YWM Ole10Native stream: OLE10NAtiVe 3012315 bytes

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