Eu segui uma dica do @This email address is being protected from spambots. You need JavaScript enabled to view it. sobre usar o Wordfence no WordPress.  E realmente funciona legal barrando várias tentativas de ataques.

Eu dei uma olhada nos de força bruta e aqui estão os logins mais usados:


MariaDB [(none)]> select username, fail, inet6_ntoa(ip), UA from wp_wflogins into outfile 'ataques.csv';

> awk '{print $1}' ataques.csv | sort -n | uniq -c | sort -n
      1 -
      1 123123
      1 1234
      1 123456
      1 123456789
      1 443/wp-login.php
      1 aaa
      1 abcd1234
      1 admaster
      1 admin.
      1 AdMiN
      1 admin123
      1 admina
      1 admini
      1 administrators
      1 adminPeach
      1 adminwp
      1 admon
      1 Adsystem
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 ahmed
      1 alfons
      1 alireza
      1 anna
      1 arrow
      1 artsadd
      1 ask6776
      1 atarihost
      1 autonewsbot
      1 awen
      1 azaret
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 Beast3x
      1 beescleaning
      1 carpetsdubai
      1 Casper_Security
      1 catmeow
      1 chris
      1 christiane
      1 Christophe
      1 control
      1 cpolo
      1 dagon
      1 darcy56
      1 Darcy56
      1 dedi
      1 demilation
      1 DemoDemo
      1 demo_w1p
      1 devadmin
      1 dexter
      1 digilabs
      1 donaljkt9
      1 dummy_store_5
      1 editor
      1 ednabanaag
      1 eliasaf
      1 enamad
      1 eosuperadmin
      1 Fabien
      1 Farribeiro
      1 gestinet
      1 globalint
      1 goog
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 GP_Admin
      1 grupovhn
      1 gtfobiash
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 hopefox34
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 info
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 Ivan
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 jbalazs8178
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 john
      1 justin
      1 kinga
      1 kobieta
      1 kulturecom
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 lluis
      1 loafa
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 mainstream
      1 marina
      1 martinharvey
      1 Megusta
      1 microadmin
      1 miruku
      1 mohit
      1 monica
      1 mungmee
      1 MUWY
      1 ndvtzaifnz
      1 Nwildner
      1 oktay-dogangun
      1 options
      1 ovauser-admin
      1 PiSh3r
      1 protan
      1 qiang521
      1 quantri
      1 raeesa
      1 Rahul
      1 redtor
      1 richard
      1 Richard
      1 ridiz
      1 rikimoh39
      1 root
      1 rootadmin
      1 roottn
      1 rzu4bd
      1 sadminusez
      1 santi2
      1 senterprisys_admin
      1 SEOExpert
      1 seojiwo
      1 seomaster009
      1 shelby96
      1 Sion
      1 siteadmin
      1 smngrs952
      1 Support
      1 temp3
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 test3
      1 tester
      1 testionos
      1 tuanduongthe
      1 tuanpham
      1 upastra007
      1 Username
      1 Vikash
      1 voquanghuy
      1 wadmiine
      1 wdmgpvt
      1 webstone24
      1 webuser
      1 wpadmin
      1 WPADMIN
      1 w-padmine
      1 wp-admine
      1 wp-blog
      1 wp_developer
      1 wpengine
      1 wp_rest_api
      1 wpsystem
      1 wpupdate
      1 wuser
      1 wwwadm
      1 xcom
      1 xtw183870bbe
      1 xtw18387106f
      1 xtw1838711ab
      1 xtw183871206
      1 xtw183871550
      1 xtw183872fc0
      1 xtw18387331a
      1 xtw1838738ca
      1 xtw183873c09
      1 xtw183874283
      1 xtw183875328
      1 xtw1838754ba
      1 xtw18387596a
      1 xtw183875977
      1 xtw1838761a5
      1 xtw183876e88
      1 xtw18387757d
      1 xtw183877c79
      1 xtw183878b0d
      1 xtw18387958b
      1 xtw183879670
      1 This email address is being protected from spambots. You need JavaScript enabled to view it.
      1 xtw18387a0c5
      1 xtw18387a9de
      1 xtw18387aa3b
      1 xtw18387adf8
      1 xtw18387c077
      1 xtw18387c339
      1 xtw18387d0aa
      1 xtw18387daad
      1 xtw18387e84d
      1 xtw18387e943
      1 xtw18387f29e
      1 xuanphong
      1 yanz
      1 zestful
      1 Zestful
      1 zokaroll
      2 12345678
      2 ac
      2 adminlin
      2 adminsup
      2 adminusez
      2 Auto
      2 bapaksaya
      2 burnolurko
      2 Clare
      2 francisunderwood
      2 greeceman
      2 happy
      2 hex
      2 hxq1879
      2 ismm
      2 jacquespermisdeconduire
      2 jatin
      2 jisuo
      2 lashkari
      2 maximixer789
      2 Nacht
      2 pajero_sports
      2 smngrs953
      2 smngrs955
      2 susan
      2 swilliams
      2 testuser
      2 thuylt
      2 wadmines
      2 This email address is being protected from spambots. You need JavaScript enabled to view it.
      2 wiktorB
      2 woopayplug
      2 wordpress_admin_bak
      2 wordpress_administratora
      2 wordpressauto
      2 wp
      2 wpenginesupport
      2 wpmanager
      2 wp_postadmin
      2 wpuser
      2 x
      2 xrumertest
      2 xtw1838729c0
      2 xtw18387754d
      2 yanz@123457
      2 yeuthuongmongmanh
      2 zadminz
      2 zutodoko
      2 This email address is being protected from spambots. You need JavaScript enabled to view it.
      3 admim
      3 admin1
      3 admin6
      3 admingusar
      3 bimak73555
      3 Chris
      3 demo
      3 This email address is being protected from spambots. You need JavaScript enabled to view it.
      3 mevivu
      3 qwee123123
      3 Reseller-webmaster
      3 talhas
      3 test1
      3 wadmine
      4 1001010
      4 andremachado
      4 crander
      4 hostingadmin
      4 matakucing3
      4 patola
      4 server
      4 stender
      4 username
      4 wordcamp
      4 wordpress_administrator
      5 administratoir
      5 administrator
      5 This email address is being protected from spambots. You need JavaScript enabled to view it.
      5 excontrol
      5 itsme
      5 support
      5 user
      5 wpadmins
      5 wpcore
      6 smngrs951
      7 nwildner
      7 paulomartins
     11 test
     12 farribeiro
     18 Admin
     19 wadminw
     28 wwwadmin
     54 linux-br
    151 df7c8c98dfd88d9dfad
   1270 admin

Realmente alguns logins existem e devem estar assinados nas páginas.  Mas o restante é estilo Forrest Gump correndo de um lado pro outro atravessando os Estados Unidos sem saber o porquê.