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

Static analysis result for SHA-256 70af60db9e13f928…

MALICIOUS

Office (OOXML) / .XLSX

2.05 MB Created: 2025-06-12 01:12:31 UTC Authoring application: Microsoft Excel 12.0000
MD5: 13d588b439f6180320b3c33b94ad70bf SHA-1: 0857f269f49f87da8a6379dd7461fe1d3e9899f1 SHA-256: 70af60db9e13f92838569a495d6113f3249dd15c5b102aa8d9640f306d9dca9c
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Office Open XML spreadsheet 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 of a vulnerability within the Equation Editor component for client execution. No scripts were extracted, and the document body was not available, but the presence of the anomalous OLE object is sufficient evidence of malicious intent.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/1yWS.9UK7y7 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
3e177e5ae573387ef3bbff770e0bc4434875453d2c503b1e4d9285666c63bfef		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/1yWS.9UK7y7 2958848 bytes
ooxml_oleobject_00_ole10native_00.bin
d01c267aa503a84bdd7e9c5bcdd250cc04ae89f7d7a8587fa7dbe72d8d512695		 ole-package OOXML xl/embeddings/1yWS.9UK7y7 Ole10Native stream: oLE10NatiVe 2933202 bytes

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