IMAP brute force
...

Aug  6 14:50:57 localhost sshd\[13395\]: Invalid user kshaheen from 118.70.215.62 port 53404
Aug  6 14:50:57 localhost sshd\[13395\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=118.70.215.62
Aug  6 14:50:59 localhost sshd\[13395\]: Failed password for invalid user kshaheen from 118.70.215.62 port 53404 ssh2

\[2019-08-06 22:40:51\] NOTICE\[3217\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '5.62.41.134:1038' \(callid: 2131878059-1462829622-390899343\) - Failed to authenticate
\[2019-08-06 22:40:51\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFailed",EventTV="2019-08-06T22:40:51.341+0200",Severity="Error",Service="PJSIP",EventVersion="1",AccountID="\",SessionID="2131878059-1462829622-390899343",LocalAddress="IPV4/UDP/188.40.118.248/5060",RemoteAddress="IPV4/UDP/5.62.41.134/1038",Challenge="1565124051/3136b3866175f975ae535c2593580268",Response="29de69f049ecdf2cac91639ab0920023",ExpectedResponse=""
\[2019-08-06 22:40:51\] NOTICE\[25634\] res_pjsip/pjsip_distributor.c: Request 'REGISTER' from '\' failed for '5.62.41.134:1038' \(callid: 2131878059-1462829622-390899343\) - Failed to authenticate
\[2019-08-06 22:40:51\] SECURITY\[1715\] res_security_log.c: SecurityEvent="ChallengeResponseFaile

Aug  6 12:27:19 l01 sshd[966070]: Invalid user cs-go from 52.82.91.92
Aug  6 12:27:19 l01 sshd[966070]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=em3-52-82-91-92.cn-northwest-1.compute.amazonaws.com.cn 
Aug  6 12:27:20 l01 sshd[966070]: Failed password for invalid user cs-go from 52.82.91.92 port 49384 ssh2
Aug  6 12:35:34 l01 sshd[967648]: Invalid user pumch from 52.82.91.92
Aug  6 12:35:34 l01 sshd[967648]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=em3-52-82-91-92.cn-northwest-1.compute.amazonaws.com.cn 
Aug  6 12:35:36 l01 sshd[967648]: Failed password for invalid user pumch from 52.82.91.92 port 52976 ssh2
Aug  6 12:38:08 l01 sshd[968196]: Did not receive identification string from 52.82.91.92
Aug  6 12:43:48 l01 sshd[969251]: Invalid user mak from 52.82.91.92
Aug  6 12:43:48 l01 sshd[969251]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= r........
-------------------------------

Aug  6 11:10:42   DDOS Attack: SRC=39.68.174.202 DST=[Masked] LEN=40 TOS=0x00 PREC=0x00 TTL=48  DF PROTO=TCP SPT=45022 DPT=80 WINDOW=0 RES=0x00 RST URGP=0

2019-08-06T22:08:51.578257stark.klein-stark.info sshd\[4145\]: Invalid user oracle from 185.247.118.119 port 38422
2019-08-06T22:08:51.584782stark.klein-stark.info sshd\[4145\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=185.247.118.119
2019-08-06T22:08:53.956710stark.klein-stark.info sshd\[4145\]: Failed password for invalid user oracle from 185.247.118.119 port 38422 ssh2
...

Spam Timestamp : 06-Aug-19 11:51 _ BlockList Provider  combined abuse _ (658)

MultiHost/MultiPort Probe, Scan, Hack -

Aug  6 14:07:31 microserver sshd[3868]: Invalid user kristine from 150.161.8.120 port 49650
Aug  6 14:07:31 microserver sshd[3868]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=150.161.8.120
Aug  6 14:07:32 microserver sshd[3868]: Failed password for invalid user kristine from 150.161.8.120 port 49650 ssh2
Aug  6 14:12:24 microserver sshd[4589]: Invalid user soham from 150.161.8.120 port 47822
Aug  6 14:12:24 microserver sshd[4589]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=150.161.8.120
Aug  6 14:27:07 microserver sshd[7154]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=150.161.8.120  user=root
Aug  6 14:27:08 microserver sshd[7154]: Failed password for root from 150.161.8.120 port 41930 ssh2
Aug  6 14:32:15 microserver sshd[8128]: Invalid user developer from 150.161.8.120 port 40008
Aug  6 14:32:15 microserver sshd[8128]: pam_unix(sshd:auth): authentication failure; logname= ui

Automatic report - Banned IP Access

Aug  6 22:22:28 dedicated sshd[16988]: Invalid user test from 198.98.53.76 port 38794

Honeypot attack, port: 23, PTR: PTR record not found

Aug  6 20:17:42 MK-Soft-VM3 sshd\[11865\]: Invalid user ts3musicbot from 5.135.179.178 port 18186
Aug  6 20:17:42 MK-Soft-VM3 sshd\[11865\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=5.135.179.178
Aug  6 20:17:44 MK-Soft-VM3 sshd\[11865\]: Failed password for invalid user ts3musicbot from 5.135.179.178 port 18186 ssh2
...

" "

Aug  6 16:02:21 debian sshd\[22211\]: Invalid user ts4 from 198.199.104.20 port 49500
Aug  6 16:02:21 debian sshd\[22211\]: pam_unix\(sshd:auth\): authentication failure\; logname= uid=0 euid=0 tty=ssh ruser= rhost=198.199.104.20
...