MSSQL, MariaDB/MySQL, Apache WEB, Apache Tomcat 등 운용 시
해당 서버(또는 PC) 기준 방화벽 설정
1. 이벤트 뷰어에서 외부 공격은 "응용 프로그램" 눌러서 접속 로그 확인
2. 이벤트 뷰어에서 보안 오류도 분단위 있을 경우 조치
3. 방화벽 인바운드 규칙 > 새 규칙 > 사용자 지정 > 모든 프로그램(기본값) > 모든 프로토콜 / 모든 로컬 포트 / 모든 원격 포트(기본값) > 이 규칙이 적용되는 원격 IP 주소 / 다음 IP 주소 / 추가 > 222.222.222.1 ~ 222.222.222.255 추가 > 연결 차단 > 완료
4. 방화벽 인바운드 IP대역 차단 CLI
netsh advfirewall firewall add rule name="DDOS 차단" dir=in action=block remoteip=61.221.207.0-61.221.207.255
5. 한국만 허용
netsh advfirewall firewall add rule name="only korean access" dir=in action=allow 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210.102.96.0/19,210.106.0.0/18,210.106.64.0/19,210.106.96.0/19,210.110.0.0/17,210.110.128.0/17,210.111.0.0/18,210.111.112.0/20,210.111.128.0/19,210.111.160.0/19,210.111.192.0/19,210.111.224.0/19,210.111.64.0/20,210.111.80.0/20,210.111.96.0/20,210.112.0.0/17,210.112.128.0/19,210.112.160.0/20,210.112.176.0/20,210.112.192.0/19,210.112.224.0/19,210.113.0.0/16,210.114.0.0/18,210.114.104.0/21,210.114.112.0/20,210.114.128.0/19,210.114.160.0/19,210.114.192.0/20,210.114.208.0/20,210.114.224.0/19,210.114.64.0/20,210.114.80.0/21,210.114.88.0/21,210.114.96.0/21,210.115.0.0/19,210.115.128.0/19,210.115.160.0/19,210.115.192.0/19,210.115.224.0/19,210.115.32.0/19,210.115.64.0/19,210.115.96.0/19,210.116.0.0/18,210.116.128.0/17,210.116.64.0/18,210.117.0.0/17,210.117.128.0/18,210.117.192.0/18,210.118.0.0/19,210.118.128.0/17,210.118.32.0/19,210.118.64.0/18,210.119.0.0/17,210.119.128.0/18,210.119.192.0/19,210.119.224.0/20,210.119.240.0/20,210.121.0.0/17,210.121.128.0/17,210.122.0.0/16,210.123.0.0/16,210.125.0.0/20,210.125.128.0/17,210.125.16.0/20,210.125.32.0/19,210.125.64.0/18,210.126.0.0/17,210.126.128.0/17,210.127.0.0/19,210.127.128.0/17,210.127.32.0/19,210.127.64.0/18,210.180.64.0/19,210.180.96.0/19,210.181.0.0/19,210.181.128.0/18,210.181.192.0/19,210.181.224.0/19,210.181.32.0/19,210.181.64.0/18,210.204.0.0/16,210.205.0.0/18,210.205.112.0/20,210.205.128.0/18,210.205.192.0/19,210.205.224.0/20,210.205.240.0/20,210.205.64.0/19,210.205.96.0/20,210.206.0.0/15,103.143.176.0/23,103.186.170.0/23,64.188.32.0/20,103.131.164.0/22,165.141.0.0/18,165.141.112.0/20,165.141.128.0/17,165.141.64.0/19,165.141.96.0/20,103.144.30.0/23,103.143.32.0/23,103.140.208.0/22,103.117.0.0/22,103.129.184.0/22,103.109.64.0/22,103.21.188.0/23,103.21.190.0/23,103.37.0.0/22,43.240.236.0/22,103.127.124.0/22,103.126.64.0/22,103.199.100.0/22,103.48.132.0/22,137.59.16.0/22,43.229.112.0/22,103.175.200.0/23,206.219.0.0/18,103.167.230.0/23,103.39.16.0/22,43.243.188.0/22,103.162.180.0/23,103.161.4.0/23,180.189.52.0/22,211.172.180.0/22,124.217.192.0/20,180.210.16.0/21,180.210.24.0/22,180.210.28.0/22,211.172.176.0/22,162.222.172.0/22,211.172.184.0/21,103.159.160.0/23,103.166.222.0/23,103.157.158.0/23,103.153.44.0/23,103.164.78.0/23,103.44.88.0/22,43.225.124.0/22,103.157.208.0/23,160.20.142.0/24,103.156.22.0/23,103.86.44.0/22,203.160.130.0/23,203.191.134.0/23,103.150.62.0/23,103.162.52.0/23,103.150.204.0/23,103.150.160.0/24,103.150.162.0/23,103.146.180.0/23,211.188.104.0/21,211.188.112.0/20,211.188.96.0/21,211.255.128.0/21,211.255.136.0/21,211.255.144.0/20,223.255.192.0/21,223.255.200.0/21,103.145.214.0/23,103.122.144.0/23,180.94.4.0/24,59.150.0.0/21,59.150.100.0/22,59.150.104.0/22,59.150.108.0/23,59.150.110.0/23,59.150.112.0/21,59.150.12.0/24,59.150.120.0/23,59.150.122.0/24,59.150.123.0/24,59.150.124.0/24,59.150.125.0/24,59.150.126.0/23,59.150.128.0/22,59.150.13.0/24,59.150.132.0/23,59.150.134.0/24,59.150.135.0/24,59.150.136.0/24,59.150.137.0/24,59.150.138.0/24,59.150.139.0/24,59.150.14.0/24,59.150.140.0/24,59.150.141.0/24,59.150.142.0/23,59.150.144.0/23,59.150.146.0/23,59.150.148.0/23,59.150.15.0/24,59.150.150.0/24,59.150.151.0/24,59.150.152.0/22,59.150.156.0/24,59.150.157.0/24,59.150.158.0/23,59.150.16.0/23,59.150.160.0/22,59.150.164.0/24,59.150.165.0/24,59.150.166.0/23,59.150.168.0/23,59.150.170.0/24,59.150.171.0/24,59.150.172.0/24,59.150.173.0/24,59.150.174.0/23,59.150.176.0/20,59.150.18.0/24,59.150.19.0/24,59.150.192.0/23,59.150.194.0/24,59.150.195.0/24,59.150.196.0/23,59.150.198.0/23,59.150.20.0/23,59.150.200.0/22,59.150.204.0/23,59.150.206.0/24,59.150.207.0/24,59.150.208.0/20,59.150.22.0/23,59.150.224.0/19,59.150.24.0/21,59.150.32.0/21,59.150.40.0/23,59.150.42.0/24,59.150.43.0/24,59.150.44.0/24,59.150.45.0/24,59.150.46.0/23,59.150.48.0/22,59.150.52.0/23,59.150.54.0/23,59.150.56.0/23,59.150.58.0/23,59.150.60.0/24,59.150.61.0/24,59.150.62.0/23,59.150.64.0/22,59.150.68.0/24,59.150.69.0/24,59.150.70.0/23,59.150.72.0/24,59.150.73.0/24,59.150.74.0/23,59.150.76.0/22,59.150.8.0/22,59.150.80.0/22,59.150.84.0/22,59.150.88.0/22,59.150.92.0/23,59.150.94.0/23,59.150.96.0/23,59.150.98.0/24,59.150.99.0/24,103.67.58.0/23,101.79.0.0/19,101.79.128.0/22,101.79.132.0/22,101.79.136.0/21,101.79.32.0/21,101.79.40.0/22,101.79.44.0/22,101.79.48.0/21,101.79.56.0/22,101.79.60.0/22,101.79.64.0/18,110.4.112.0/22,110.4.116.0/22,110.4.120.0/21,110.4.64.0/19,110.4.96.0/20,113.30.104.0/22,113.30.108.0/22,113.30.112.0/20,113.30.64.0/21,113.30.72.0/21,113.30.80.0/20,113.30.96.0/21,114.141.0.0/21,114.141.12.0/22,114.141.16.0/22,114.141.20.0/22,114.141.24.0/21,114.141.8.0/22,124.217.208.0/20,180.210.0.0/21,180.210.32.0/19,180.210.64.0/18,180.210.8.0/21,182.252.128.0/20,182.252.144.0/22,182.252.148.0/22,182.252.152.0/21,182.252.160.0/21,182.252.168.0/22,182.252.172.0/22,182.252.176.0/22,182.252.180.0/22,182.252.184.0/21,182.252.192.0/18,185.130.49.0/24,103.218.172.0/23,157.66.64.0/23,
- 국가별 IP 대역 / KISA
https://xn--3e0bx5euxnjje69i70af08bea817g.xn--3e0b707e/jsp/statboard/IPAS/ovrse/natal/IPaddrBandCurrent.jsp?nationCode1=KR
- 엑셀 편집, IP 추출
- 파워쉘로 공격 당한 IP만 자동 등록 / 의미는 없음, 해당 IP 차단하면 감지하여 새로운 IP 공격 확인
$DT = [DateTime]::Now.AddDays(-1) # check only last 24 hours
$l = Get-EventLog -LogName 'Security' -InstanceId 4625 -After $DT | Select-Object @{n='IpAddress';e={$_.ReplacementStrings[-2]} } # select Ip addresses that has audit failure
$g = $l | group-object -property IpAddress | where {$_.Count -gt 20} | Select -property Name # get ip adresses, that have more than 20 wrong logins
$fw = New-Object -ComObject hnetcfg.fwpolicy2 # get firewall object
$ar = $fw.rules | where {$_.name -eq 'ExternalAttackBlock'} # get firewall rule named 'BlockAttackers' (must be created manually)
$arRemote = $ar.RemoteAddresses -split(',') #split the existing IPs into an array so we can easily search for existing IPs
$w = $g | where {$_.Name.Length -gt 1 -and !($arRemote -contains $_.Name + '/255.255.255.255') } # get ip addresses that are not already in firewal rule. Include the subnet mask which is automatically added to the firewall remote IP declaration.
$w| %{$ar.remoteaddresses += ',' + $_.Name} # add IPs to firewall rule
* 라우터 또는 별도 방화벽 장비 설정 별도
* 특히 MSSQL 설치 되어 있을 경우 중국발 공격 많이 발생하며 다른 서비스 공격이 없는 것은 별도 방화벽 장비에서 막아서 로그 없을 수 있음
6. 방화벽 설정 결론
- IP 차단은 끝이 없음
- 포트 다 차단
- 공격 대상 포트 변경 / 레지스트리 변경은 귀찮, 파워셀 이용 변경 / DOS CLI 환경에서 powershell 입력 실행 후 아래 입력
$portvalue = 13390
Set-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber" -Value $portvalue
New-NetFirewallRule -DisplayName 'RDPPORTLatest-TCP-In' -Profile 'Public' -Direction Inbound -Action Allow -Protocol TCP -LocalPort $portvalue
New-NetFirewallRule -DisplayName 'RDPPORTLatest-UDP-In' -Profile 'Public' -Direction Inbound -Action Allow -Protocol UDP -LocalPort $portvalue
- 서비스 레지스트리 값을 알고 있으면 사용 포트 확인도 가능
Get-ItemProperty -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp' -name "PortNumber"
- 변경 포트만 특정 IP에서 접근 허용
① 방화벽 인바운 규칙에서 위에서 파워셀로 추가한 "RDPPORTLatest-TCP-In" 확인하여 더블 클릭
② 영역 탭 클릭
③ 원격 IP 주소에 원격에서 접속할 PC 퍼블릭 IP 입력
④ 등록한 IP 컴퓨터에서 원격 접속 테스트 / OK