Pox

Pox is another non-daemon overwrite program, Pox is also only usable against a system CPU. It causes a glitch in ICE installation; whenever the 'runner encounters ICE that is summoned or attacks from ambush (as opposed to ICE already in place), there is a 3 in 10 chance the ICE will derezz upon activation. Preventing Pox from acting and removing it is the same as for Cascade.

Source

 * Rache Bartmoss Brainware Blowout, pg.74