Saha waé anu parantos nyobian ngajalankeun mesin virtual dina méga éta sadar yén port RDP standar, upami ditinggalkeun kabuka, bakal langsung diserang ku gelombang sandi usaha brute force tina sababaraha alamat IP di sakumna dunya.
Dina tulisan ieu kuring bakal nunjukkeun kumaha Anjeun tiasa ngonpigurasikeun réspon otomatis kana sandi brute force ku cara nambahkeun aturan anyar kana firewall. InTrust nyaeta pikeun ngumpulkeun, nganalisa sareng nyimpen data anu teu terstruktur, anu parantos ngagaduhan ratusan réaksi anu tos siap pikeun sagala rupa serangan.
Dina Quest InTrust anjeun tiasa ngonpigurasikeun tindakan réspon nalika aturan dipicu. Tina agén pangumpulan log, InTrust nampi pesen ngeunaan usaha otorisasi anu gagal dina workstation atanapi server. Pikeun ngonpigurasikeun tambihan alamat IP anyar kana firewall, anjeun kedah nyalin aturan adat anu tos aya pikeun ngadeteksi sababaraha otorisasi anu gagal sareng muka salinanana pikeun ngédit:
Kajadian dina log Windows nganggo anu disebut InsertionString. (Ieu mangrupa login gagal kana sistem) jeung anjeun bakal nempo yén widang urang museurkeun disimpen dina InsertionString14 (Ngaran Workstation) jeung InsertionString20 (Alamat Network Sumber). Nalika narajang ti Internet, widang Workstation Ngaran paling dipikaresep bakal. janten kosong, jadi tempat ieu penting ngaganti nilai tina Alamat Network Sumber.
Ieu mangrupikeun téks acara 4625:
An account failed to log on.
Subject:
Security ID: S-1-5-21-1135140816-2109348461-2107143693-500
Account Name: ALebovsky
Account Domain: LOGISTICS
Logon ID: 0x2a88a
Logon Type: 2
Account For Which Logon Failed:
Security ID: S-1-0-0
Account Name: Paul
Account Domain: LOGISTICS
Failure Information:
Failure Reason: Account locked out.
Status: 0xc0000234
Sub Status: 0x0
Process Information:
Caller Process ID: 0x3f8
Caller Process Name: C:WindowsSystem32svchost.exe
Network Information:
Workstation Name: DCC1
Source Network Address: ::1
Source Port: 0
Detailed Authentication Information:
Logon Process: seclogo
Authentication Package: Negotiate
Transited Services: -
Package Name (NTLM only): -
Key Length: 0
This event is generated when a logon request fails. It is generated on the computer where access was attempted.
The Subject fields indicate the account on the local system which requested the logon. This is most commonly a service such as the Server service, or a local process such as Winlogon.exe or Services.exe.
The Logon Type field indicates the kind of logon that was requested. The most common types are 2 (interactive) and 3 (network).
The Process Information fields indicate which account and process on the system requested the logon.
The Network Information fields indicate where a remote logon request originated. Workstation name is not always available and may be left blank in some cases.
The authentication information fields provide detailed information about this specific logon request.
- Transited services indicate which intermediate services have participated in this logon request.
- Package name indicates which sub-protocol was used among the NTLM protocols.
- Key length indicates the length of the generated session key. This will be 0 if no session key was requested.
Salaku tambahan, urang bakal nambihan nilai Alamat Jaringan Sumber kana téks acara.
Teras anjeun kedah nambihan skrip anu bakal meungpeuk alamat IP dina Windows Firewall. Di handap ieu conto anu bisa dipaké pikeun ieu.
Skrip pikeun nyetél firewall
param(
[Parameter(Mandatory = $true)]
[ValidateNotNullOrEmpty()]
[string]
$SourceAddress
)
$SourceAddress = $SourceAddress.Trim()
$ErrorActionPreference = 'Stop'
$ruleName = 'Quest-InTrust-Block-Failed-Logons'
$ruleDisplayName = 'Quest InTrust: Blocks IP addresses from failed logons'
function Get-BlockedIps {
(Get-NetFirewallRule -Name $ruleName -ErrorAction SilentlyContinue | get-netfirewalladdressfilter).RemoteAddress
}
$blockedIps = Get-BlockedIps
$allIps = [array]$SourceAddress + [array]$blockedIps | Select-Object -Unique | Sort-Object
if (Get-NetFirewallRule -Name $ruleName -ErrorAction SilentlyContinue) {
Set-NetFirewallRule -Name $ruleName -RemoteAddress $allIps
} else {
New-NetFirewallRule -Name $ruleName -DisplayName $ruleDisplayName -Direction Inbound -Action Block -RemoteAddress $allIps
}
Ayeuna anjeun tiasa ngarobih nami aturan sareng pedaran pikeun ngahindarkeun kabingungan engké.
Ayeuna anjeun kedah nambihan naskah ieu salaku tindakan réspon kana aturan, aktipkeun aturan, sareng mastikeun yén aturan anu cocog diaktipkeun dina kawijakan ngawaskeun sacara real-time. Agén kedah diaktipkeun pikeun ngajalankeun skrip réspon sareng kedah gaduh parameter anu leres.
Saatos setélan réngsé, jumlah otorisasi anu henteu suksés turun ku 80%. Keuntungan? Naon hiji hébat!
Kadang paningkatan leutik lumangsung deui, tapi ieu alatan mecenghulna sumber anyar serangan. Lajeng sagalana mimiti turun deui.
Salila saminggu gawé, 66 alamat IP ditambahkeun kana aturan firewall.
Di handap ieu tabel kalawan 10 usernames umum anu dipaké pikeun usaha otorisasina.
ngaran pamaké
jumlah
Dina persentase
anu ngolola
1220235
40.78
admin
672109
22.46
nu make
219870
7.35
ngabengkokkeun
126088
4.21
contoso.com
73048
2.44
administrator
55319
1.85
server
39403
1.32
sgazlabdc01.contoso.com
32177
1.08
pangurus
32377
1.08
sgazlabdc01
31259
1.04
Béjakeun ka kami dina koméntar kumaha anjeun ngabales ancaman kaamanan inpormasi. Sistem naon anu anjeun anggo sareng kumaha merenahna?
Upami anjeun resep ningali InTrust dina aksi, dina formulir eupan balik dina ramatloka urang atawa nulis ka kuring dina pesen pribadi.
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sumber: www.habr.com