It is probably not best to just copy paste this into your banned.txt but this is a good reference if you suspect someone on your server of being a greifer.

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igrief
eddeddy0
Munther
sunda
chickenslivers
0ni
lemuel
plokoon9619
normantimbers
lolkiller
mark0vmo0ll
vouteaorabo
bigbodybenz
coursecheater
maby
imannoyinglol
siglemic
shanx
civicity
okeydokey
crazysk8ter
nixon
wreckingball
vetle
natorgove
stoich
lolmastah
wiro
whereswally
adsone
broskt
craftmeister
chalky_joe
gonju
jojo26
fpoon
swiss
that_other_guy