Office (OOXML) / .XLSX malware analysis — malicious · 92c3c84f664b9b2e

MALICIOUS

Office (OOXML) / .XLSX

2.20 MB Created: 2025-09-22 22:56:50 UTC Authoring application: Microsoft Excel 12.0000

MD5: c234cbffeb28814b4d11171a38c3cd7e SHA-1: 1c38e41b45a7d45bb6b5ae9f3f8dde1982ac39e3 SHA-256: 92c3c84f664b9b2e877a5f25df3bd328c61e5a021b8357155757e480d0b038dd

80 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The sample is an Excel document containing an embedded OLE object, specifically identified as an Equation Editor object. The document also contains a heuristic firing indicating a lure to enable macros or editing, a common technique for malware droppers. This suggests the embedded object is likely a malicious payload intended to be executed upon user interaction.

Heuristics 3

Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR

Embedded OLE object xl/embeddings/9UjMssA.8FgJ contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
Embedded OLE object medium OOXML_OLE_OBJECT

Document contains an embedded OLE object
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`ooxml_oleobject_00.bin` `93a20d89a5a49dceb1a141ba4cfd4cbf4c80fe9bdf0c73a1c607d09c6e00e58e`	ooxml-ole-object	OOXML embedded OLE part: xl/embeddings/9UjMssA.8FgJ	2774016 bytes

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