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

Static analysis result for SHA-256 7a64d300b11efd05…

MALICIOUS

Office (OOXML) / .XLSX

1.98 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: 64cabbf1c42443f5f9b4c33eef01acd1 SHA-1: dcdaabfea5fd4cb24c67ae03c364b9e664ac3392 SHA-256: 7a64d300b11efd050fbad4bab555a60a1f4332b6f65549402b20827d60e3ff73
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML (OOXML) file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header and size discrepancy, strongly suggesting exploitation. This technique is commonly used to execute arbitrary code on the victim's machine.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/ktEnZF.QP 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
a6075122393761a783f47f7398233861ac95e31d16b8e8229ce788e284eae50a		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/ktEnZF.QP 2778624 bytes
ooxml_oleobject_00_ole10native_00.bin
e9e61f51d7283f47b4b2ab17e84af07ef41811cdf7264e3c144e36743945b74e		 ole-package OOXML xl/embeddings/ktEnZF.QP Ole10Native stream: OlE10nAtIVE 2754541 bytes

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