hire a programmer to create a Wp plugin Infection (virus)

as in subject, we need to hire a programmer who been able to create / infect one plugin of OUR wordpress installation we need this to study the action/benefits of our web anti-virus solution we are building right now. to ensure high level protection we want to let a virus will hack our test installations and verify what anti-infection results we can achieve. basically the code and the plugin to be "infected" can be choose from the coder, we will install it directly into our wordpress installation and let it run the basics of requested "virus" are: 1-must not be detectable inside wordpress 2-has to activate itself NOT immediately, but, let's say, after a day, a month etc..we choose different times to test 3-damage can be choose by the coder, but must create a high level of problem and damage , like mysql erasing, corruption of several files, and so on. PLEASE no "jokes" like black screen with "this is a virus". we need to simulate a REAl hughe hack attack we can also accept a piece of php code (with above specs) to be inserted in core Worpress installation again, this job is finalize to a R&D purpose