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Basically, anything from malware to ddosing to outright Hollywood Hacking: What are notable examples of cyberwarfare in the 41st millenium? Lexicanum mentions scrapcode generators for subverting machine spirits, while Arynakyr has the ability to subvert enemy weapon systems.

Are there any Imperial/AdMech organizations that are the equivalent of sanctioned hackers? Or Tau that engage in similar ideals (replacing a Ministorium broadcast with the Tau Ri'kr'ol), etc?

When it began its assault on the Orpheus sector, the Necron maynarkh dynasty sent a simple signal "Maynarkh comes" that basically fried every electronic system that received it. The only way to save affected electronics was to galvinically purge them and hope the system wouldn't be too damaged by the purge to make it a wasted effort.

Of course, the Necrons have literal technopaths so counting them is kind of cheating.

There isn't much. I imagine the AdMech has some branch dedicated to that, but each race basically has totally incompatible computer systems.

I think the best example was in Calth in the Heresy. Hacking into the Orbital Defense with Chaos code. There were a few others like that I know but I don't remember...

Yeah, the most common example is Chaos Scrap code. the forge of Mars trilogy also introduces the concept of some sort of special signal that seperates a machine from it's machine spirit.

For Necrons, it does seem to depend on whether the Dynasty considers it honorable/if humans and tau are worthy of honorable battle, but when they do do it, it's never so much cyberwarfare as it is a cybercurbstomp.

There's a special named character in the Forgeworld Mechanicum codex who has a "data-djinn engram" which is a short range one use haywire attack.

It's a floppy disc with that Archer pirate virus on it, I assume.