This is not a bug that can get on the surface and burrow in.
You start with pain, burrow into dirt, get to memory, and end with motive.
If opened, the RAT will burrow into the host computer and give control of the machine to the hacker.
"rabbit-hole, fox-hole, etc.," c.1300, borewe, from Old English burgh "stronghold, fortress" (see borough); influenced by bergh "hill," and berwen "to defend, take refuge."
c.1600, "to place in a burrow, from burrow (n.). Figuratively (e.g. to burrow (one's) head) by 1862. Intransitive sense, "to bore one's way into, penetrate" is from 1610s, originally figurative (literal sense, of animals, attested by 1771). Related: Burrowed; borrowing.