해킹당하고 있는것인지 답변 부탁합니다

아래는 저희 회사에서 테스트로 돌리고 있는 서버의 /var/log 에서
secure의 내용입니다.

제가 초심자라 무슨내용인지 잘모르겠지만 혹시 이것이 68.156.179.83 번 아이피를 가진사람이 저희 서버로 ssh 접속을 하는것인지 답변 부탁합니다 ㅡ,.ㅡ

그럼 즐거운 하루 되세요

Jun 20 06:27:29 gware sshd[30931]: Invalid user alberto from 68.156.179.83
Jun 20 06:27:32 gware sshd[30931]: Failed password for invalid user alberto from 68.156.179.83 port 59108 ssh2
Jun 20 06:27:35 gware sshd[30933]: Invalid user alejandra from 68.156.179.83
Jun 20 06:27:37 gware sshd[30933]: Failed password for invalid user alejandra from 68.156.179.83 port 59933 ssh2
Jun 20 06:27:40 gware sshd[30935]: Invalid user alejandro from 68.156.179.83
Jun 20 06:27:42 gware sshd[30935]: Failed password for invalid user alejandro from 68.156.179.83 port 60913 ssh2
Jun 20 06:27:45 gware sshd[30937]: Invalid user alicia from 68.156.179.83
Jun 20 06:27:48 gware sshd[30937]: Failed password for invalid user alicia from 68.156.179.83 port 33497 ssh2
Jun 20 06:27:52 gware sshd[30939]: Invalid user alfredo from 68.156.179.83
Jun 20 06:27:54 gware sshd[30939]: Failed password for invalid user alfredo from 68.156.179.83 port 34292 ssh2
Jun 20 06:27:57 gware sshd[30941]: Invalid user alfonso from 68.156.179.83
Jun 20 06:28:00 gware sshd[30941]: Failed password for invalid user alfonso from 68.156.179.83 port 36065 ssh2
Jun 20 06:28:02 gware sshd[30943]: Invalid user amaya from 68.156.179.83
Jun 20 06:27:35 gware sshd[30933]: Invalid user alejandra from 68.156.179.83
Jun 20 06:27:37 gware sshd[30933]: Failed password for invalid user alejandra from 68.156.179.83 port 59933 ssh2
Jun 20 06:27:40 gware sshd[30935]: Invalid user alejandro from 68.156.179.83
Jun 20 06:27:42 gware sshd[30935]: Failed password for invalid user alejandro from 68.156.179.83 port 60913 ssh2
Jun 20 06:27:45 gware sshd[30937]: Invalid user alicia from 68.156.179.83
Jun 20 06:27:48 gware sshd[30937]: Failed password for invalid user alicia from 68.156.179.83 port 33497 ssh2
Jun 20 06:27:52 gware sshd[30939]: Invalid user alfredo from 68.156.179.83
Jun 20 06:27:54 gware sshd[30939]: Failed password for invalid user alfredo from 68.156.179.83 port 34292 ssh2
Jun 20 06:27:57 gware sshd[30941]: Invalid user alfonso from 68.156.179.83
Jun 20 06:28:00 gware sshd[30941]: Failed password for invalid user alfonso from 68.156.179.83 port 36065 ssh2
Jun 20 06:28:02 gware sshd[30943]: Invalid user amaya from 68.156.179.83
Jun 20 06:28:05 gware sshd[30943]: Failed password for invalid user amaya from 68.156.179.83 port 37219 ssh2
Jun 20 06:28:08 gware sshd[30945]: Invalid user a303261a from 68.156.179.83
Jun 20 06:28:10 gware sshd[30945]: Failed password for invalid user a303261a from 68.156.179.83 port 38374 ssh2
Jun 20 06:28:13 gware sshd[30947]: Invalid user andres from 68.156.179.83
Jun 20 06:28:16 gware sshd[30947]: Failed password for invalid user andres from 68.156.179.83 port 40550 ssh2
Jun 20 06:28:18 gware sshd[30949]: Invalid user angel from 68.156.179.83
Jun 20 06:28:21 gware sshd[30949]: Failed password for invalid user angel from 68.156.179.83 port 42124 ssh2
Jun 20 06:28:24 gware sshd[30951]: Invalid user angela from 68.156.179.83
Jun 20 06:28:26 gware sshd[30951]: Failed password for invalid user angela from 68.156.179.83 port 43731 ssh2
Jun 20 06:28:29 gware sshd[30953]: Invalid user angelo from 68.156.179.83
Jun 20 06:28:31 gware sshd[30953]: Failed password for invalid user angelo from 68.156.179.83 port 45326 ssh2
Jun 20 06:28:35 gware sshd[30955]: Invalid user anita from 68.156.179.83
Jun 20 06:28:38 gware sshd[30955]: Failed password for invalid user anita from 68.156.179.83 port 46888 ssh2
Jun 20 06:28:41 gware sshd[30957]: Invalid user antonio from 68.156.179.83
Jun 20 06:28:43 gware sshd[30957]: Failed password for invalid user antonio from 68.156.179.83 port 48762 ssh2
Jun 20 06:28:46 gware sshd[30959]: Invalid user armando from 68.156.179.83
Jun 20 06:28:48 gware sshd[30959]: Failed password for invalid user armando from 68.156.179.83 port 50453 ssh2
Jun 20 06:28:51 gware sshd[30961]: Invalid user arturo from 68.156.179.83
Jun 20 06:28:53 gware sshd[30961]: Failed password for invalid user arturo from 68.156.179.83 port 52000 ssh2
Jun 20 06:28:57 gware sshd[30963]: Invalid user bernardo from 68.156.179.83
Jun 20 06:28:59 gware sshd[30963]: Failed password for invalid user bernardo from 68.156.179.83 port 53597 ssh2
Jun 20 06:29:02 gware sshd[30965]: Invalid user blanca from 68.156.179.83
Jun 20 06:29:04 gware sshd[30965]: Failed password for invalid user blanca from 68.156.179.83 port 55141 ssh2
Jun 20 06:29:06 gware sshd[30967]: Invalid user carla from 68.156.179.83
Jun 20 06:29:09 gware sshd[30967]: Failed password for invalid user carla from 68.156.179.83 port 56886 ssh2
Jun 20 06:29:11 gware sshd[30969]: Invalid user carlos from 68.156.179.83
Jun 20 06:29:13 gware sshd[30969]: Failed password for invalid user carlos from 68.156.179.83 port 58104 ssh2
Jun 20 06:29:20 gware sshd[30971]: Invalid user carmel from 68.156.179.83
Jun 20 06:29:22 gware sshd[30971]: Failed password for invalid user carmel from 68.156.179.83 port 59584 ssh2
Jun 20 06:29:25 gware sshd[30973]: Invalid user carmen from 68.156.179.83
Jun 20 06:29:28 gware sshd[30973]: Failed password for invalid user carmen from 68.156.179.83 port 34063 ssh2
Jun 20 06:29:30 gware sshd[30975]: Invalid user catalina from 68.156.179.83
Jun 20 06:29:32 gware sshd[30975]: Failed password for invalid user catalina from 68.156.179.83 port 35506 ssh2
Jun 20 06:29:35 gware sshd[30977]: Invalid user cesar from 68.156.179.83
Jun 20 06:29:37 gware sshd[30977]: Failed password for invalid user cesar from 68.156.179.83 port 36948 ssh2
Jun 20 06:29:40 gware sshd[30979]: Invalid user cielo from 68.156.179.83
Jun 20 06:29:42 gware sshd[30979]: Failed password for invalid user cielo from 68.156.179.83 port 38359 ssh2
Jun 20 06:29:45 gware sshd[30981]: Invalid user clara from 68.156.179.83
Jun 20 06:29:48 gware sshd[30981]: Failed password for invalid user clara from 68.156.179.83 port 39807 ssh2
Jun 20 06:29:50 gware sshd[30983]: Invalid user claudia from 68.156.179.83
Jun 20 06:29:52 gware sshd[30983]: Failed password for invalid user claudia from 68.156.179.83 port 41350 ssh2
Jun 20 06:29:54 gware sshd[30985]: Invalid user consuelo from 68.156.179.83
Jun 20 06:29:56 gware sshd[30985]: Failed password for invalid user consuelo from 68.156.179.83 port 42626 ssh2
Jun 20 06:29:59 gware sshd[30987]: Invalid user cristian from 68.156.179.83
Jun 20 06:30:02 gware sshd[30987]: Failed password for invalid user cristian from 68.156.179.83 port 44085 ssh2
Jun 20 06:30:04 gware sshd[30989]: Invalid user diego from 68.156.179.83
Jun 20 06:30:06 gware sshd[30989]: Failed password for invalid user diego from 68.156.179.83 port 45738 ssh2
Jun 20 08:23:17 gware sshd[31008]: Accepted password for charisma from 61.107.120.2 port 55986 ssh2
Jun 20 08:57:23 gware sshd[31060]: Did not receive identification string from 203.71.72.252
Jun 20 08:57:24 gware sshd[31059]: Did not receive identification string from 203.71.72.252