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

Static analysis result for SHA-256 5e825d8804a30cb0…

MALICIOUS

Office (OOXML) / .XLSX

2.87 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: 77cb7f7b017af889306b6e89a2caf0dc SHA-1: eecf70c8b698270589caa353b7aa81ef48a2b006 SHA-256: 5e825d8804a30cb0c770a77a4a560c93bb311c4c7d36a5d89369be5df22f94b2
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The file contains an embedded OLE object, specifically identified as a Microsoft Equation Editor object. Heuristics indicate that this object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's used to exploit a vulnerability for client execution. The specific embedded object path is noted as an IOC.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/erFF7.Qwe 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
52dbd62ebd80f9aeba5722c7a4a63d72b1d72ceb80e5ccfb14b03d577c641f3e		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/erFF7.Qwe 2989056 bytes
ooxml_oleobject_00_ole10native_00.bin
29ef040cb5632228f5ebced569bb51aaa50ab26ba78fd4189b50531387900b2f		 ole-package OOXML xl/embeddings/erFF7.Qwe Ole10Native stream: olE10NatIVE 2963184 bytes

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