I don't think this is currently possible using existing dependencies mechanism or predefined triggers.
However, build triggers are now pluggable (since ~5.8 I think) and there might be a plugin that does what you are looking for. Unfortunately I don't know of any. And I'm not sure if implementing custom triggers in Bamboo is documented.
An alternative solution would be to add the rollback as a stage in the same build plan, if it's not very advanced. You could add some conditions to all tasks if they should or should not be executed (e.g. all logic can be done within a script task, which could just read a variable or look through artifacts produced by previous stages and decide what to do). But this seems like an ugly workaround, not what you're trying to achieve.
You can try plugin I created to show how to create new trigger. It's not tested nor supported officially by Atlassian. Look at https://bitbucket.org/chystoprudov/bamboo-failtrigger-plugin/overview.
I'll be happy if it will solve your use case
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