getdriver Get print driver information netname: ADMIN$ This tool is part of the samba(7) suite. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1012 Once we have a SID we can enumerate the rest. *[0-9a-z]' | tr -d '\n' & echo -n "$rhost: " &, echo "exit" | smbclient -L $rhost 1>/dev/null 2>/dev/null. with a RID:[0x457] Hex 0x457 would = decimal. srvinfo Server query info setprinter Set printer comment I create my own checklist for the first but very important step: Enumeration. Try "help" to get a list of possible commands. To look for possible exploits to the SMB version it important to know which version is being used. This can be extracted using the lookupnames command used earlier. SMB allows you to share your resources to other computers over the network, version susceptible to known attacks (Eternal blue , wanna cry), Disabled by default in newer Windows version, reduced "chattiness" of SMB1. To enumerate the Password Properties on the domain, the getdompwinfo command can be used. | \\[ip]\IPC$: Similarly to enumerate the Primary Domain Information such as the Role of the machine, Native more of the Domain can be done using the dsroledominfo command as demonstrated. C$ NO ACCESS Disk Permissions Since we performed enumeration on different users, it is only fair to extend this to various groups as well. result was NT_STATUS_NONE_MAPPED --------------- ---------------------- rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2004 exit takes care of any password request that might pop up, since were checking for null login. 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. The hash can then be cracked offline or used in an. for all files), recurse: toggles recursion on (default: off), prompt: toggles prompting for filenames off (default: on), mget: copies all files matching the mask from host to client machine, Specially interesting from shares are the files called, by all authenticated users in the domain. samquerysecobj Query SAMR security object This will help in getting the information such as the kind of password policies that have been enforced by the Administrator in the domain. 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. Upon running this on the rpcclient shell, it will extract the groups with their RID. This information includes the Group Name, Description, Attributes, and the number of members in that group. result was NT_STATUS_NONE_MAPPED | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-0143 The createdomgroup command is to be used to create a group. LSARPC | smb-vuln-ms17-010: It is possible to perform enumeration regarding the privileges for a group or a user based on their SID as well. result was NT_STATUS_NONE_MAPPED 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. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. . The connection uses. Guest access disabled by default. This command can help with the enumeration of the LSA Policy for that particular domain. dfsadd Add a DFS share It is possible to enumerate the SAM data through the rpcclient as well. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1000 querygroupmem Query group membership A collection of commands and tools used for conducting enumeration during my OSCP journey. My #1 SMB tip: if the exploit you're using fails despite the target appearing vulnerable, reset the machine and try again. Nmap scan report for [ip] netfileenum Enumerate open files IPC$ NO ACCESS This will use, as you point out, port 445. echodata Echo data Can try without a password (or sending a blank password) and still potentially connect. Allow connecting to the service without using a password? Allow listing available shares in the current share? -l, --log-basename=LOGFILEBASE Basename for log/debug files Which script should be executed when the script gets closed? The tool that we will be using for all the enumerations and manipulations will be rpcclient. RPC is built on Microsofts COM and DCOM technologies. dfsremove Remove a DFS share First one - two Cobalt Strike sessions: PID 260 - beacon injected into dllhost process. Beyond the enumeration I show here, it will also help enumerate shares that are readable, and can ever execute commands on writable shares. 623/UDP/TCP - IPMI. At last, it can be verified using the enumdomusers command. Ill include examples, but where I use PWK labs, Ill anonymize the data per their rules. rpcclient $> queryuser msfadmin. Learn more about the OS Versions. Code execution don't work. abortshutdown Abort Shutdown There are numerous tools and methods to perform enumeration, we will be finding different types of information on SMB throughout the article. queryusergroups Query user groups 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. Active Directory & Kerberos Abuse. none Force RPC pipe connections to have no special properties, Lets play with a few options: -i, --scope=SCOPE Use this Netbios scope, Authentication options: enumdrivers Enumerate installed printer drivers Read previous sections to learn how to connect with credentials/Pass-the-Hash. rpcclient $> help Software applications that run on a NetBIOS network locate and identify each other via their NetBIOS names. --------------- ---------------------- Using rpcclient it is possible to create a group. This command helps the attacker enumerate the security objects or permissions and privileges related to the security as demonstrated below. dfsexist Query DFS support It has a total of 67 users. remark: IPC Service (Mac OS X) 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. Shortcut to New Folder (2).lnk A 420 Sun Dec 13 05:24:51 2015 LSARPC-DS . Beyond the enumeration I show here, it will also help enumerate shares that are readable, and can ever execute commands on writable shares. While Port 139 is known technically as NBT over IP, Port 445 is SMB over IP. In this specific demonstration, there are a bunch of users that include Administrator, yashika, aarti, raj, Pavan, etc. getprinter Get printer info Upon running this on the rpcclient shell, it will extract the usernames with their RID. NETLOGON READ ONLY | grep -oP 'UnixSamba. There was a Forced Logging off on the Server and other important information. result was NT_STATUS_NONE_MAPPED It can be observed that the os version seems to . SPOOLSS result was NT_STATUS_NONE_MAPPED NT_STATUS_ACCESS_DENIED or NT_STATUS_BAD_NETWORK_NAME), # returns NT_STATUS_ACCESS_DENIED or even gives you a session. Pentesting Cheatsheets. | Anonymous access: In this communication, the child process can make requests from a parent process. On other systems, youll find services and applications using port 139. createdomuser Create domain user This will attempt to connect to the share. | Anonymous access: A tag already exists with the provided branch name. In the demonstration below, the attacker chooses S-1-1-0 SID to enumerate. Enum4linux. | Type: STYPE_DISKTREE 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. Match. Connect to wwwroot share (try blank password), Nmap scans for SMB vulnerabilities (NB: can cause DoS), Enumerate SNMP device (places info in readable format), Enumerate file privileges (see here for discussion of file_priv), Check if current user superuser (on = yes, off = no), Check users privileges over table (pg_shadow). guest access disabled, uses encryption. Author: Pavandeep Singhis a Technical Writer, Researcher, and Penetration Tester. One of the first enumeration commands to be demonstrated here is the srvinfo command. path: C:\tmp We have enumerated the users and groups on the domain but not enumerated the domain itself. This command can be used to extract the details regarding the user that the SID belongs. getprintprocdir Get print processor directory You get the idea, was pretty much the same for the Ubuntu guy cept that his user accounts were -3000. After enumerating groups, it is possible to extract details about a particular group from the list. Query Group Information and Group Membership. | Comment: 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. Created with Xmind. For this particular demonstration, we will first need a SID. 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. --------- ---- ------- Host script results: 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. To extract information about the domain, the attacker can provide the domain name as a parameter to the command lookupdomain as demonstrated. The next command to observe is the lsaquerysecobj command. and therefore do not correspond to the rights assigned locally on the server. lsaenumprivsaccount Enumerate the privileges of an SID -I, --dest-ip=IP Specify destination IP address, Help options Description. As with the lsaenumsid, it was possible to extract the SID but it was not possible to tell which user has that SID. In the demonstration, it can be observed that the current user has been allocated 35 privileges. PORT STATE SERVICE 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. One of the first enumeration commands to be demonstrated here is the srvinfo command. deleteform Delete form The SID was retrieved using the lookupnames command. To enumerate these shares the attacker can use netshareenum on the rpcclient. Null sessions were enabled by default on legacy systems but have been disabled from Windows XP SP2 and Windows Server 2003. The name is derived from the enumeration of domain groups. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2003 schannel Force RPC pipe connections to be sealed with 'schannel' (NETSEC). certcube provides a detailed guide of oscp enumeration with step by step oscp enumeration cheatsheet. IPC$ NO ACCESS --------------- ---------------------- ---- ----------- While having some privileges it is also possible to create a user within the domain using the rpcclient. SaAddUsers 0:65281 (0x0:0xff01) | Risk factor: HIGH ADMIN$ Disk Remote Admin Enumerate Domain Users. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1005 The next command that can be used is enumalsgroups. Enumerating Windows Domains with rpcclient through SocksProxy == Bypassing Command Line Logging, https://www.samba.org/samba/docs/current/man-html/rpcclient.1.html, https://github.com/SecureAuthCorp/impacket/tree/master/examples, https://www.cobaltstrike.com/help-socks-proxy-pivoting, https://www.youtube.com/watch?v=l8nkXCOYQC4&index=19&list=WL&t=7s, code execution on a target system and the beacon is calling back to the team server, PID 260 - beacon injected into dllhost process. | This can be verified using the enumdomgroups command. | Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010) MAC Address: 00:50:56:XX:XX:XX (VMware) SHUTDOWN Running something like ngrep -i -d tap0 's.?a.?m.?b.?a. S-1-5-21-1835020781-2383529660-3657267081-1007 LEWISFAMILY\sys (2) --------------- ---------------------- rpcclient $> enumprivs | Comment: Default share This will extend the amount of information about the users and their descriptions. -U, --user=USERNAME Set the network username Most secure. 3. Hydra v5.1 (c) 2005 by van Hauser / THC - use allowed only for legal purposes. | and SP2, and Server 2003 SP1 and earlier allows remote unauthenticated or authenticated attackers to Nmap done: 1 IP address (1 host up) scanned in 5.58 seconds, # Requires root or enough permissions to use tcpdump, # Will listen for the first 7 packets of a null login, # Will sometimes not capture or will print multiple. Disk Permissions enumdomgroups Enumerate domain groups [Update 2018-12-02] I just learned about smbmap, which is just great. RPC or Remote Procedure Call is a service that helps establish and maintain communication between different Windows Applications. As with the previous commands, the share enumeration command also comes with the feature to target a specific entity. If proper privileges are assigned it also possible to delete a user using the rpcclient. To extract further information about that user or in case during the other enumeration the attacker comes into the touch of the SID of a user, then they cause to use the lookupsids command to get more information about that particular user. dfsgetinfo Query DFS share info The rpcclient was designed to perform debugging and troubleshooting tasks on a Windows Samba configuration. If used the RID is the parameter, the samlookuprids command can extract the username relevant to that particular RID. Cheatsheet. In the demonstration, the user with RID 0x1f4 was enumerated regarding their password properties. It is possible to target the group using the RID that was extracted while running the enumdomgroup. 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. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1013 All this can be observed in the usage of the lsaenumprivaccount command. addform Add form We can filter on ntlmssp.ntlmv2_response to see NTLMv2 traffic, for example. | Disclosure date: 2017-03-14 queryuser Query user info In the demonstration, it can be observed that the user has stored their credentials in the Description. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. May need to run a second time for success. The command netsharegetinfo followed by the name of the share you are trying to enumerate will extract details about that particular share. Code & Process Injection. What script needs to be executed on the user's login? There are times where these share folders may contain sensitive or Confidential information that can be used to compromise the target. To enumerate a particular user from rpcclient, the queryuser command must be used. S-1-5-21-1835020781-2383529660-3657267081-1009 LEWISFAMILY\tty (2) shutdown Remote Shutdown That narrows the version that the attacker might be looking at to Windows 10, Windows Server 2016, and Windows Server 2019. Reconnecting with SMB1 for workgroup listing. SegFault:~ cg$rpcclient -U "" 192.168.182.36 List of SMB versions and corresponding Windows versions: SMB1 Windows 2000, XP and Windows 2003. Many system administrators have now written scripts around it to manage Windows NT clients from their UNIX workstation. As from the previous commands, we saw that it is possible to create a user through rpcclient. getdispname Get the privilege name if IPC$ share is enabled , and have anonymous access we can enumerate users through, SAMBA 3.x-4.x # vulnerable to linux/samba/is_known_pipename, SAMBA 3.5.11 # vulnerable to linux/samba/is_known_pipename, good script to use if none of scanner giving version for smb, # Requires root or enough permissions to use tcpdump, # Will listen for the first 7 packets of a null login, # Will sometimes not capture or will print multiple.
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