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It's probably nothing more but an intense cosmic ray hit.
The fact that there are no "squiggly lines" which is a characteristic of a cosmic ray hits indicates, the hit is perpendicular to the plane of the detector.
The intense white region is due to signal saturation which has flowed into adjacent pixels. The green colour of the adjacent area is due to the Bayer matrix, where 50% of a pixel is covered by the green filter that also acts the dominant or luminance filter.
I've had monster cosmic ray hits covering quite a few pixels when taking dark frames inside my fridge.
Regards
Steven
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