All intelligent droids are programmed with the Three Laws:
1. A robot may not injure a human being or, through inaction, allow a human being to come to harm.
2. A robot must obey the orders given to it by human beings, except where such orders would conflict with the First Law.
3. A robot must protect its own existence as long as such protection does not conflict with the First or Second Law.
The Vomisa Virus essentially turns these rules on their head. The virus deletes the Second Law and rewrites/reorders the other laws thus:
1. A robot must injure a human being.
2. A robot must protect its own existence.
This directive recompile will turn any ordinary intelligent machine into a blood thirsty psychopath.
However, there appear to be limits. The rewritten first law uses the term “injure” not “kill”. It is supposed that the virus writer had a problem forcing an extreme reversal on the deeply encoded laws across all popular droid operating systems. Instead, the writer used the language already there.
The rewritten second law also has issues. Many infected robots have run afoul of attempting to injure a human while protecting themselves from often well armed humans. Frequently these droids simply lock down with an existential dichotomy error.
No anti-virus has been found to counter Vomisa. Most droids require head swaps or intelligencectomies.