Ok, first of all it's almost impossible to get this sort of sound right out of a Virus alone, or basically any other synth for that matter because it requires some layering and resampling.
Theoretically, most of those dnb basslines are based on a classic reese/reece sound (a pair of detuned and distorted saw waves) and then split into two or sometimes even 3 channels on the desk with EQ's, one channel for low frequencies, second channel for midrange, and third channel for the higher frequency part. However three channels it's an overkill, two channels are usually more than enough. Each channel being processed individually with a unique chain of effects. Then the whole thing gets resampled and filtered to beyond recognition, sometimes if it's still not enough to get the desired results it's getting resampled again.
Practically, in those two particular tunes it sounds like mostly the midrange part of the reese being used, and a plain sub layered underneath. There's many ways to get this sound anyway, but from what i can hear there's tonnes of strong chorus and very sharp filtering action with 24 or 36db slope going on here. (maybe even couple of filters in parallel?) Probably bandpass or a combination of low-pass with high-pass. In dnb it's all about overprocessing the shit out of your sound by violently abusing effects and raping filters.
Regarding reeses, the Gamera PR preset in your virus would be a good starting point.
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