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

Static analysis result for SHA-256 044e7c18a439f064…

MALICIOUS

Office (OOXML) / .XLSX

2.90 MB Created: 2025-09-10 01:57:00 UTC Authoring application: Microsoft Excel 15.0300
MD5: d971e3048d7df7acec9e620cdf5a5e18 SHA-1: 96baf4461c4dd513463400dfe529a56c8d3a6751 SHA-256: 044e7c18a439f06441c28dcc6f9686158eb5dd50d0bee9a8767e770fb2caefa9
100 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded OLE object, specifically identified as a Microsoft Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous header, strongly suggesting exploitation of a vulnerability within the Equation Editor. This technique is commonly used to achieve arbitrary code execution on the victim's machine.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/GZ6.yFrMl6 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
3744aed460fbe22c0449fb77910bf43221c10933c3e18b7f3d6ae2f9cca705ac		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/GZ6.yFrMl6 3016704 bytes
ooxml_oleobject_00_ole10native_00.bin
0c85ecbaea94a149d88a025b92a95c26540eb1a2fedc66791e358014348edbeb		 ole-package OOXML xl/embeddings/GZ6.yFrMl6 Ole10Native stream: ole10NatIve 2990376 bytes

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