rpcclient enumeration oscp

After creating the users and changing their passwords, its time to manipulate the groups. In other words - it's possible to enumerate AD (or create/delete AD users, etc.) Next, we have two query-oriented commands. It contains contents from other blogs for my quick reference, * nmap -sV --script=vulscan/vulscan.nse (https://securitytrails.com/blog/nmap-vulnerability-scan), masscan -p1-65535,U:1-65535 --rate=1000 10.10.10.x -e tun0 > ports, ports=$(cat ports | awk -F " " '{print $4}' | awk -F "/" '{print $1}' | sort -n | tr '\n' ',' | sed 's/,$//'), nmap -Pn -sC -sV --script=vuln*.nse -p$ports 10.10.10.x -T5 -A, (performs full scan instead of syn-scan to prevent getting flagged by firewalls), From Apache Version to finding Ubuntu version -> ubuntu httpd versions, : Private key that is used for login. |_ https://technet.microsoft.com/en-us/library/security/ms06-025.aspx Test. exit Exit program rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2002 Start by typing "enum" at the prompt and hitting <tab><tab>: rpcclient $> enum enumalsgroups enumdomains enumdrivers enumkey enumprivs enumdata enumdomgroups enumforms enumports enumtrust enumdataex enumdomusers enumjobs enumprinter. | State: VULNERABLE OSCP notes: ACTIVE INFORMATION GATHERING. Host script results: If used the RID is the parameter, the samlookuprids command can extract the username relevant to that particular RID. --------------- ---------------------- LSARPC . result was NT_STATUS_NONE_MAPPED May need to run a second time for success. Obviously the SIDS are different but you can still pull down the usernames and start bruteforcing those other open services . # lines. SYSVOL NO ACCESS, [+] Finding open SMB ports. SecureAuthCorp/impacket, https://www.cobaltstrike.com/help-socks-proxy-pivoting. You signed in with another tab or window. rpcclient is a part of the Samba suite on Linux distributions. Adding it to the original post. The below shows traffic captures that illustrate that the box 10.0.0.2 enumerates 10.0.0.7 using SMB traffic only: Below further proves that the box 10.0.0.2 (WS01 which acted as proxy) did not generate any sysmon logs and the target box 10.0.0.7 (WS02) logged a couple of events, that most likely would not attract much attention from the blue teams: Note how only the SMB traffic between the compromised system and the DC is generated, but no new processes are spawned by the infected. Can be Contacted onTwitterandLinkedIn, All Rights Reserved 2021 Theme: Prefer by, Windows Privilege Escalation: DnsAdmins to DomainAdmin. S-1-5-21-1835020781-2383529660-3657267081-1005 LEWISFAMILY\kmem (2) Obviously the SIDS are different but you can still pull down the usernames and start bruteforcing those other open services. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2003 rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-500 As with the previous commands, the share enumeration command also comes with the feature to target a specific entity. sinkdata Sink data All rights reserved. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2001 [STATUS] 29.00 tries/min, 29 tries in 00:01h, 787 todo in 00:28h | RRAS Memory Corruption vulnerability (MS06-025) Many groups are created for a specific service. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1011 | and SP2, and Server 2003 SP1 and earlier allows remote unauthenticated or authenticated attackers to With an anonymous null session you can access the IPC$ share and interact with services exposed via named pipes. Description. The rpcclient was designed to perform debugging and troubleshooting tasks on a Windows Samba configuration. result was NT_STATUS_NONE_MAPPED -z $2 ]; then rport=$2; else rport=139; fi, tcpdump -s0 -n -i tap0 src $rhost and port $rport -A -c 7 2>/dev/null | grep -i "samba\|s.a.m" | tr -d '.' It has undergone several stages of development and stability. This article can serve as a reference for Red Team activists for attacking and enumerating the domain but it can also be helpful for the Blue Team to understand and test the measures applied on the domain to protect the Network and its users. Most secure. yet another reason to adjust your file & printer sharing configurations when you take your computer on the road (especially if you share your My Documents folder), Yeah so i was bored on the hotel wirelesserrr laband started seeing who had ports 135, 139, 445 open. certcube provides a detailed guide of oscp enumeration with step by step oscp enumeration cheatsheet. so lets run rpcclient with no options to see whats available: SegFault:~ cg$ rpcclient If in the above example the ttl=127, then it is safe to assume (from this information alone) that the host, 10.10.10.10, is a Linux host. Once proxychains are configured, the attacker can start enumerating the AD environment through the beacon like so: Moving on, same way, they can query info about specific AD users: Enumerate current user's privileges and many more (consult rpcclient for all available commands): Finally, of course they can run nmap if needed: Impacket provides even more tools to enumerate remote systems through compromised boxes. 1433 - Pentesting MSSQL - Microsoft SQL Server. It can be done with the help of the createdomuser command with the username that you want to create as a parameter. When provided the username, it extracts information such as the username, Full name, Home Drive, Profile Path, Description, Logon Time, Logoff Time, Password set time, Password Change Frequency, RID, Groups, etc. It can be used on the rpcclient shell that was generated to enumerate information about the server. Beyond the enumeration I show here, it will also help enumerate shares that are readable, and can ever execute commands on writable shares. deletedomuser Delete domain user if [ -z $1 ]; then echo "Usage: ./smbver.sh RHOST {RPORT}" && exit; else rhost=$1; fi, if [ ! getdompwinfo Retrieve domain password info Code execution don't work. It is a software protocol that allows applications, PCs, and Desktops on a local area network (LAN) to communicate with network hardware and to transmit data across the network. -d, --debuglevel=DEBUGLEVEL Set debug level This is an enumeration cheat sheet that I created while pursuing the OSCP. --------------- ---------------------- getdataex Get printer driver data with keyname Hydra (http://www.thc.org) starting at 2007-07-27 21:51:46 rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1014 Enumerating Windows Domains with rpcclient through SocksProxy == Bypassing Command Line Logging This lab shows how it is possible to bypass commandline argument logging when enumerating Windows environments, using Cobalt Strike and its socks proxy (or any other post exploitation tool that supports socks proxying). You can indicate which option you prefer to use with the parameter, # Using --exec-method {mmcexec,smbexec,atexec,wmiexec}, via SMB) in the victim machine and use it to, it is located on /usr/share/doc/python3-impacket/examples/, #If no password is provided, it will be prompted, Stealthily execute a command shell without touching the disk or running a new service using DCOM via, #You can append to the end of the command a CMD command to be executed, if you dont do that a semi-interactive shell will be prompted, Execute commands via the Task Scheduler (using, https://www.hackingarticles.in/beginners-guide-to-impacket-tool-kit-part-1/, #Get usernames bruteforcing that rids and then try to bruteforce each user name, This attack uses the Responder toolkit to. This group constitutes 7 attributes and 2 users are a member of this group. To demonstrate this, the attacker first used the lsaaddpriv command to add the SeCreateTokenPrivielge to the SID and then used the lsadelpriv command to remove that privilege from that group as well. great when smbclient doesnt work, Rpcclient is a Linux tool used for executing client-side MS-RPC functions. Nmap scan report for [ip] Nice! result was NT_STATUS_NONE_MAPPED samquerysecobj Query SAMR security object | IDs: CVE:CVE-2017-0143 Replication READ ONLY Reconnecting with SMB1 for workgroup listing. Red Team Infrastructure. To enumerate a particular user from rpcclient, the queryuser command must be used. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Running something like ngrep -i -d tap0 's.?a.?m.?b.?a. getprinter Get printer info queryusergroups Query user groups Learning about various kinds of compromises that can be performed using Mimikatz we know that the SID of a user is the security Identifier that can be used for a lot of elevating privileges and minting tickets attacks. # download everything recursively in the wwwroot share to /usr/share/smbmap. Heres an example Unix Samba 2.2.3a: Windows SMB is more complex than just a version, but looking in wireshark will give a bunch of information about the connection. NT_STATUS_ACCESS_DENIED or NT_STATUS_BAD_NETWORK_NAME), # returns NT_STATUS_ACCESS_DENIED or even gives you a session. In the demonstration presented, there are two domains: IGNITE and Builtin. Port_Number: 137,138,139 #Comma separated if there is more than one. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-501 srvinfo Server query info At last, it can be verified using the enumdomusers command. One of the first enumeration commands to be demonstrated here is the srvinfo command. . rpcclient $> lookupnames root timeout connecting to 192.168.182.36:445 SMB stands for Server Message Blocks. This can be obtained by running the lsaenumsid command. 1098/1099/1050 - Pentesting Java RMI - RMI-IIOP. authentication 139/tcp open netbios-ssn New Folder (9) D 0 Sun Dec 13 05:26:59 2015 SaAddUsers 0:65281 (0x0:0xff01) A tag already exists with the provided branch name. | Anonymous access: When dealing with SMB an attacker is bound to be dealt with the Network Shares on the Domain. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. There are multiple methods to connect to a remote RPC service. null session or valid credentials). rpcclient $> netshareenum | Comment: Remote Admin It is possible to enumerate the SAM data through the rpcclient as well. lookupsids Convert SIDs to names WORKGROUP <00> - M S-1-5-21-1835020781-2383529660-3657267081-1003 LEWISFAMILY\daemon (2) dfsexist Query DFS support [INFO] Reduced number of tasks to 1 (smb does not like parallel connections) D 0 Thu Sep 27 16:26:00 2018 | .. D 0 Thu Sep 27 16:26:00 2018 --------------- ---------------------- rpcclient (if 111 is also open) NSE scripts. The enum4linux utility within Kali Linux is particularly useful; with it, you can obtain the following: If you don't know what is NTLM or you want to know how it works and how to abuse it, you will find very interesting this page about. Further, when the attacker used the same SID as a parameter for lsaenumprivaccount, they were able to enumerate the levels of privileges such as high, low, and attribute. --------------- ---------------------- SAMR On other systems, youll find services and applications using port 139. setform Set form The ability to interact with privileges doesnt end with the enumeration regarding the SID or privileges. -S, --signing=on|off|required Set the client signing state shutdownabort Abort Shutdown (over shutdown pipe) RPC or Remote Procedure Call is a service that helps establish and maintain communication between different Windows Applications. After manipulating the Privileges on the different users and groups it is possible to enumerate the values of those specific privileges for a particular user using the lsalookupprivvalue command. This is purely my experience with CTFs, Tryhackme, Vulnhub, and Hackthebox prior to enrolling in OSCP. Hence, they usually set up a Network Share. The next command to demonstrate is lookupsids. See the below example gif. There are times where these share folders may contain sensitive or Confidential information that can be used to compromise the target. Since we already performed the enumeration of such data before in the article, we will enumerate using enumdomgroup and enumdomusers and the query-oriented commands in this demonstration. Metasploit SMB auxiliary scanners. In this article, we were able to enumerate a wide range of information through the SMB and RPC channel inside a domain using the rpcclient tool. adddriver Add a print driver [DATA] 1 tasks, 1 servers, 816 login tries (l:1/p:816), ~816 tries per task Usage: rpcclient [OPTION] |_smb-vuln-regsvc-dos: ERROR: Script execution failed (use -d to debug) queryuser Query user info --------------- ---------------------- | Comment: Upon running this on the rpcclient shell, it will extract the groups with their RID. This will extend the amount of information about the users and their descriptions. | grep -oP 'UnixSamba. debuglevel Set debug level | Current user access: READ/WRITE | VULNERABLE: querydispinfo Query display info dsenumdomtrusts Enumerate all trusted domains in an AD forest Since we performed enumeration on different users, it is only fair to extend this to various groups as well. This command can be used to extract the details regarding the user that the SID belongs. Nowadays it is not very common to encounter hosts that have null sessions enabled, but it is worth a try if you do stumble across one. Cheatsheet. rewardone in the PWK forums posted a neat script to easily get Samba versions: When you run this on a box running Samba, you get results: When in doubt, we can check the smb version in PCAP. schannel Force RPC pipe connections to be sealed with 'schannel' (NETSEC). We can filter on ntlmssp.ntlmv2_response to see NTLMv2 traffic, for example. netname: PSC 2170 Series To enumerate these shares the attacker can use netshareenum on the rpcclient. lsaaddacctrights Add rights to an account rpcclient $> lookupnames guest Enumerate Domain Users. result was NT_STATUS_NONE_MAPPED | Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010) The alias is an alternate name that can be used to reference an object or element. Password: setprinter Set printer comment Guest access disabled by default. After the tunnel is up, you can comment out the first socks entry in proxychains config. platform_id : 500 netname: IPC$ -N, --no-pass Don't ask for a password In the demonstration, it can be observed that lsaenumsid has enumerated 20 SIDs within the Local Security Authority or LSA. This cheat sheet should not be considered to be complete and only represents a snapshot in time when I used these commands for performing enumeration during my OSCP journey. <03> - M 1. Query Group Information and Group Membership. SHUTDOWN As from the previous commands, we saw that it is possible to create a user through rpcclient. lsaremoveacctrights Remove rights from an account After that command was run, rpcclient will give you the most excellent "rpcclient> " prompt. The ability to enumerate individually doesnt limit to the groups but also extends to the users. MSRPC was originally derived from open source software but has been developed further and copyrighted by . --------------- ---------------------- queryuseraliases Query user aliases is SMB over Ip. Wordlist dictionary. | \\[ip]\IPC$: -s, --configfile=CONFIGFILE Use alternative configuration file When provided with the username to the samlookupnames command, it can extract the RID of that particular user. Curious to see if there are any "guides" out there that delve into SMB . I found one guy running OS X 10.4 with Samba running and one guy running Ubuntu with Samba running, oh and also one guy running XP SP0/1 vulnerable to DCOM (wont even go down that road). getprintprocdir Get print processor directory method. ADMIN$ NO ACCESS With some input from the NetSecFocus group, Im building out an SMB enumeration check list here. {% endcode-tabs %}. These commands should only be used for educational purposes or authorised testing. One of the first enumeration commands to be demonstrated here is the srvinfo command. After creating the group, it is possible to see the newly created group using the enumdomgroup command. lsaquerysecobj Query LSA security object In the scenarios where there is a possibility of multiple domains in the network, there the attacker can use enumdomains to enumerate all the domains that might be deployed in that network. | servers (ms17-010). Which script should be executed when the script gets closed? The tool is written in Perl and is basically . | Anonymous access: READ # lines. When used with the builtin parameter, it shows all the built-in groups by their alias names as demonstrated below. Enum4linux is a Linux alternative to enum.exe and is used to enumerate data from Windows and Samba hosts. Software applications that run on a NetBIOS network locate and identify each other via their NetBIOS names. So, it is also a good way to enumerate what kind of services might be running on the server, this can be done using enumdomgroup. This lab shows how it is possible to bypass commandline argument logging when enumerating Windows environments, using Cobalt Strike and its socks proxy (or any other post exploitation tool that supports socks proxying). ? When using the enumdomgroup we see that we have different groups with their respective RID and when this RID is used with the queryusergroups it reveals information about that particular holder or RID. If you get credentials, you can re-run to show new access: nmap --script smb-enum-shares -p 139,445 [ip]. For the demonstration here, RID 0x200 was used to find that it belongs to the Domain Admin groups. In this specific demonstration, there are a bunch of users that include Administrator, yashika, aarti, raj, Pavan, etc. | smb-vuln-ms17-010: | Anonymous access: S-1-5-21-1835020781-2383529660-3657267081-1009 LEWISFAMILY\tty (2) The Windows library URLMon.dll automatically try to authenticaticate to the host when a page tries to access some contect via SMB, for example: Which are used by some browsers and tools (like Skype), From: http://www.elladodelmal.com/2017/02/como-hacer-ataques-smbtrap-windows-con.html, Similar to SMB Trapping, planting malicious files onto a target system (via SMB, for example) can illicit an SMB authentication attempt, allowing the NetNTLMv2 hash to be intercepted with a tool such as Responder. Using rpcclient we can enumerate usernames on those OSs just like a windows OS. Disclaimer: These notes are not in the context of any machines I had during the OSCP lab or exam. guest access disabled, uses encryption. -U, --user=USERNAME Set the network username wwwroot Disk The privileges can be enumerated using the enumprivs command on rpcclient. In the demonstration, a user hacker is created with the help of a createdomuser and then a password is provided to it using the setuserinfo2 command. | \\[ip]\share: See examples in the previous section. Initial Access. result was NT_STATUS_NONE_MAPPED rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2000 | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143 |_smb-vuln-ms10-054: false S-1-5-21-1835020781-2383529660-3657267081-1007 LEWISFAMILY\sys (2) ADMIN$ NO ACCESS GENERAL OPTIONS If these kinds of features are not enabled on the domain, then it is possible to brute force the credentials on the domain. [+] IP: [ip]:445 Name: [ip] rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1001 {% code-tabs-item title="attacker@kali" %}. If proper privileges are assigned it also possible to delete a user using the rpcclient. These commands can enumerate the users and groups in a domain. shutdowninit Remote Shutdown (over shutdown pipe) [+] User SMB session establishd on [ip] help Get help on commands OSCP Enumeration Cheat Sheet. | Risk factor: HIGH This is an enumeration cheat sheet that I created while pursuing the OSCP. Match. 794699 blocks available, Starting Nmap 7.70 ( https://nmap.org ) at 2018-09-27 16:37 EDT Server Comment . can be cracked with, For passwordless login, add id_rsa.pub to target's authorized_keys, Add the extracted domain to /etc/hosts and dig again, rpcclient --user="" --command=enumprivs -N 10.10.10.10, rpcdump.py 10.11.1.121 -p 135 | grep ncacn_np // get pipe names, smbclient -L //10.10.10.10 -N // No password (SMB Null session), crackmapexec smb 10.10.10.10 -u '' -p '' --shares, crackmapexec smb 10.10.10.10 -u 'sa' -p '' --shares, crackmapexec smb 10.10.10.10 -u 'sa' -p 'sa' --shares, crackmapexec smb 10.10.10.10 -u '' -p '' --share share_name, crackmapexec smb 192.168.0.115 -u '' -p '' --shares --pass-pol, ncrack -u username -P rockyou.txt -T 5 10.10.10.10 -p smb -v, mount -t cifs "//10.1.1.1/share/" /mnt/wins, mount -t cifs "//10.1.1.1/share/" /mnt/wins -o vers=1.0,user=root,uid=0,gid=0. Using rpcclient we can enumerate usernames on those OS's just like a windows OS. | Comment: Remote IPC Sharename Type Comment Enumerate Domain Groups. smbmap -H [ip/hostname] will show what you can do with given credentials (or null session if no credentials). After establishing the connection, to get the grasp of various commands that can be used you can run the help. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1003 [Original] As Ive been working through PWK/OSCP for the last month, one thing Ive noticed is that enumeration of SMB is tricky, and different tools fail / succeed on different hosts. --------- -------, Starting Nmap 7.70 ( https://nmap.org ) at 2018-09-27 16:25 EDT This is purely my experience with CTFs, Tryhackme, Vulnhub, and Hackthebox prior to enrolling in OSCP. To enumerate the shares manually you might want to look for responses like NT_STATUS_ACCESS_DENIED and NT_STATUS_BAD_NETWORK_NAME, when using a valid session (e.g. SMB allows you to share your resources to other computers over the network, version susceptible to known attacks (Eternal blue , wanna cry), Disabled by default in newer Windows version, reduced "chattiness" of SMB1. Disk Permissions Then the attacker used the SID to enumerate the privileges using the lsaenumacctrights command. It is also possible to manipulate the privileges of that SID to make them either vulnerable to a particular privilege or remove the privilege of a user altogether. createdomuser Create domain user 139/tcp open netbios-ssn Using lookupnames we can get the SID. This can be done by providing the Username and Password followed by the target IP address of the server. samsync Sam Synchronisation This command helps the attacker enumerate the security objects or permissions and privileges related to the security as demonstrated below. A collection of commands and tools used for conducting enumeration during my OSCP journey. Allow listing available shares in the current share? 445/tcp open microsoft-ds Reverse Shell. This information can be elaborated on using the querydispinfo. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1010 |_ https://blogs.technet.microsoft.com/msrc/2017/05/12/customer-guidance-for-wannacrypt-attacks/ | Type: STYPE_DISKTREE Host is up (0.030s latency). This command is made from LSA Query Security Object. However, for this particular demonstration, we are using rpcclient. Let's see how this works by firstly updating the proxychains config file: {% code-tabs %} 445/tcp open microsoft-ds At this point in time, if you can use anonymous sessions, then there are some very useful commands within the tool. password: rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1006 --------- ------- password: MAC Address: 00:50:56:XX:XX:XX (VMware) The manipulation of the groups is not limited to the creation of a group. . samdeltas Query Sam Deltas That command reveals the SIDs for different users on the domain. During that time, the designers of the rpcclient might be clueless about the importance of this tool as a penetration testing tool. You can also fire up wireshark and list target shares with smbclient , you can use anonymous listing to explained above and after that find , # smbenum 0.2 - This script will enumerate SMB using every tool in the arsenal, echo -e "\n########## Getting Netbios name ##########", echo -e "\n########## Checking for NULL sessions ##########", output=`bash -c "echo 'srvinfo' | rpcclient $IP -U%"`, echo -e "\n########## Enumerating domains ##########", bash -c "echo 'enumdomains' | rpcclient $IP -U%", echo -e "\n########## Enumerating password and lockout policies ##########", echo -e "\n########## Enumerating users ##########", nmap -Pn -T4 -sS -p139,445 --script=smb-enum-users $IP, bash -c "echo 'enumdomusers' | rpcclient $IP -U%", bash -c "echo 'enumdomusers' | rpcclient $IP -U%" | cut -d[ -f2 | cut -d] -f1 > /tmp/$IP-users.txt, echo -e "\n########## Enumerating Administrators ##########", net rpc group members "Administrators" -I $IP -U%, echo -e "\n########## Enumerating Domain Admins ##########", net rpc group members "Domain Admins" -I $IP -U%, echo -e "\n########## Enumerating groups ##########", nmap -Pn -T4 -sS -p139,445 --script=smb-enum-groups $IP, echo -e "\n########## Enumerating shares ##########", nmap -Pn -T4 -sS -p139,445 --script=smb-enum-shares $IP, echo -e "\n########## Bruteforcing all users with 'password', blank and username as password", hydra -e ns -L /tmp/$IP-users.txt -p password $IP smb -t 1, hydra -t 1 -V -f -l administrator -P /usr/share/wordlists/rockyou.txt $ip smb, nmap -p445 --script smb-brute --script-args userdb=userfilehere,passdb=/usr/share/seclists/Passwords/Common-Credentials/10-million-password-list-top-1000000.txt $ip -vvvv. # You will be asked for a password but leave it blank and press enter to continue.

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