Alcon

Alcon, or RSY (which is more or less as commonly used of a name as Alcon), is a computer virus that was discovered to be spreading in Europe in 1997. It is a boot virus. Infection Alcon is a standard boot sector virus that spreads via floppies. Instead of the MBR, it infects the DBR, making some antivirus programs miss it. Symptoms Alcon contains no notable symptoms beyond one extremely damaging one, which is overwriting random information. Assuming that the overwrites are subtle, this may result in significant compounding data over time, as Alcon is a slow damager. Alcon contains the text "R.SY".