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

Static analysis result for SHA-256 6622604a0ae918bb…

MALICIOUS

Office (OOXML) / .XLSX

2.44 MB Created: 2025-10-29 06:20:05 UTC Authoring application: Microsoft Excel 12.0000
MD5: 3d113c4be8db5b1aadaf8049f40c6c36 SHA-1: a476c1d6649ede0d9f08ba476ac041642e2e80bf SHA-256: 6622604a0ae918bbf94038c3a5d71f79f2a17f04f8380417bbad5966957bcf65
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file contains a high-severity heuristic indicating an embedded Equation Editor OLE object that carries a payload-like Ole10Native stream. This strongly suggests exploitation of a vulnerability within the Equation Editor component, likely leading to client execution. The presence of an embedded OLE object and the nature of the exploit point towards a spearphishing attachment delivery vector.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/rwtB.hDgC7 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
c8f97b4da6b0df67ef1b596b5b318b8cd6b4ef4bbb539176dde366ef76851e05		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/rwtB.hDgC7 2962944 bytes
ooxml_oleobject_00_ole10native_00.bin
3057433b532665762332361840dd2a2e8e83906355943de121c53bc7189d0ee1		 ole-package OOXML xl/embeddings/rwtB.hDgC7 Ole10Native stream: ole10NatIvE 2936975 bytes

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