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

Static analysis result for SHA-256 14c326921d33c02e…

MALICIOUS

Office (OOXML) / .XLSX

2.14 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: 44ed12cfb7bf2296a34987cb92b0c176 SHA-1: fa0c67a3c019f70928fb7e39716b0d3b5c616b42 SHA-256: 14c326921d33c02e0b462ade8e50cf34f83e83ab5b82ea21a865d473aee2715a
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. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream, suggesting it's designed to execute arbitrary code. The presence of this exploit strongly points to an attempt to achieve client execution via a known vulnerability.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/mzHe2.beM1Ry8 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
e2597d12e62a82e7d34384042fe6a62eb61a2d5322a10ac50246b871b47180bc		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/mzHe2.beM1Ry8 3059200 bytes
ooxml_oleobject_00_ole10native_00.bin
da9e6dd92a5e5c5d0dcf8722f8ac58bb638a09466fa6ed2a43a205fdd3f5f82f		 ole-package OOXML xl/embeddings/mzHe2.beM1Ry8 Ole10Native stream: ole10naTiVE 3033047 bytes

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