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I have this phenomenon often with my dslr, but the pixels are coloured. I believe it is hot pixels. The trail shows flexure. Did you do hot pixel removal on individual subs before aligning and stacking? If you do a stack of the subs without alignment and the hot spots show on top of each other it should confirm the source. It may be a case of 'quite warm' pixels helped along with thermal effects in the sensor rather than true 'hot' pixels. From the difference in intensity between two rows shown in your example indicates there is a time relationship for intensity. I am surprised they are not removed by dark subtraction. Is the dark frame you used current, or one taken some time ago?
HTH
Brian
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