Threat is anti-personnel/anti-system German program is popular with smaller European businesses because It is effective against Netrunners without actually attacking them in any way, so it is legal under the stricter Euro-codes. If it successfully attacks, it manipulates the 1-G circuits in the cyberdeck in order to give the 'runner the "feeling" that their meat body is in danger. This is a very subtle; a sort of random sensory leakage. The Netrunner can attempt to ignore the feeling, but this requires a COOL+1D10 roll vs a D10 + program's STR. Otherwise, the 'runner jacks out to "deal with the threat" If the Netrunner has a Flipswitch on his deck the program must make a second successful attack roll in order to jam the switch (again, forcing a jackout to deal with the "threat").
Source[]
- Chromebook Volume 3, pg.79