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

Static analysis result for SHA-256 01d12781392070c3…

MALICIOUS

Office (OOXML) / .XLSX

2.03 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: 18898be335277e09bf21701197fcdd3c SHA-1: cdabd7a5b9b33774f81d8c4d5aff6dbdafdf87a2 SHA-256: 01d12781392070c3326fbbe214b0562ba6bf2f02521e017c41780289dcbd227f
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor exploit. This exploit is designed to execute arbitrary code, likely a second-stage payload, on the victim's machine. The high entropy and anomalous stream size within the Equation Editor object strongly indicate malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/Vk4rSAC.YiC contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • 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
229a6a7925ab4e3d24103c61e451ed5a264eeae4c26a75b3d4d6d6458fc06d36		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/Vk4rSAC.YiC 2908672 bytes
ooxml_oleobject_00_ole10native_00.bin
1e4bfe9b9f8c47e97e5a478e859d753b926688a0e04053d83cc4c5d32424a207		 ole-package OOXML xl/embeddings/Vk4rSAC.YiC Ole10Native stream: oLe10naTIVe 2883076 bytes

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