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. Microsoft Remote Procedure Call, also known as a function call or a subroutine call, is a protocol that uses the client-server model in order to allow one program to request service from a program on another computer without having to understand the details of that computer's network. result was NT_STATUS_NONE_MAPPED If these kinds of features are not enabled on the domain, then it is possible to brute force the credentials on the domain. We have enumerated the users and groups on the domain but not enumerated the domain itself. --------- ---- ------- | \\[ip]\ADMIN$: SeTakeOwnershipPrivilege 0:9 (0x0:0x9) 1098/1099/1050 - Pentesting Java RMI - RMI-IIOP. Let's see how this works by firstly updating the proxychains config file: Once proxychains are configured, the attacker can start enumerating the AD environment through the beacon like so: proxychains rpcclient 10.0.0.6 -U spotless, Victim (10.0.0.2) is enumerating DC (10.0.0.6) on behalf of attacker (10.0.0.5). The polices that are applied on a Domain are also dictated by the various group that exists. It may be possible that you are restricted to display any shares of the host machine and when you try to list them it appears as if there aren't any shares to connect to. result was NT_STATUS_NONE_MAPPED 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. [INFO] Reduced number of tasks to 1 (smb does not like parallel connections) These may indicate whether the share exists and you do not have access to it or the share does not exist at all. | \\[ip]\wwwroot: Nice! RID is a suffix of the long SID in a hexadecimal format. | grep -oP 'UnixSamba. Beyond the enumeration I show here, it will also help enumerate shares that are readable, and can ever execute commands on writable shares. nmap -p 139,445 --open -oG smb.txt 192.168.1.0/24, nmap --script smb-enum-shares -p 139,445 $ip, smbclient -L //10.10.10.3/ --option='client min protocol=NT1', # if getting error "protocol negotiation failed: NT_STATUS_CONNECTION_DISCONNECTED", SAMBA 3.x-4.x # vulnerable to linux/samba/is_known_pipename, SAMBA 3.5.11 # vulnerable to linux/samba/is_known_pipename, nmap --script=smb-enum* --script-args=unsafe=1 -T5 $ip, nmap --script=smb-vuln* --script-args=unsafe=1 -T5 $ip, nmap --script=smb2-capabilities,smb-print-text,smb2-security-mode.nse,smb-protocols,smb2-time.nse,smb-psexec,smb2-vuln-uptime,smb-security-mode,smb-server-stats,smb-double-pulsar-backdoor,smb-system-info,smb-vuln-conficker,smb-enum-groups,smb-vuln-cve2009-3103,smb-enum-processes,smb-vuln-cve-2017-7494,smb-vuln-ms06-025,smb-enum-shares,smb-vuln-ms07-029,smb-enum-users,smb-vuln-ms08-067,smb-vuln-ms10-054,smb-ls,smb-vuln-ms10-061,smb-vuln-ms17-010,smb-os-discovery --script-args=unsafe=1 -T5 $ip, nmap -p139,445 -T4 -oN smb_vulns.txt -Pn --script 'not brute and not dos and smb-*' -vv -d $ip, Windows NT, 2000, and XP (most SMB1) - VULNERABLE: Null Sessions can be created by default, Windows 2003, and XP SP2 onwards - NOT VULNERABLE: Null Sessions can't be created default. Might ask for password. echodata Echo data Which script should be executed when the script gets closed? Depending on the user privilege it is possible to change the password using the chgpasswd command. Common share names for windows targets are, You can try to connect to them by using the following command, # null session to connect to a windows share, # authenticated session to connect to a windows share (you will be prompted for a password), "[+] creating a null session is possible for, # no output if command goes through, thus assuming that a session was created, # echo error message (e.g. An attacker can create an account object based on the SID of that user. 1433 - Pentesting MSSQL - Microsoft SQL Server. samquerysecobj Query SAMR security object OSCP-Cheatsheets/enumerating-windows-domains-using-rpcclient - Github New Folder (9) D 0 Sun Dec 13 05:26:59 2015 1080 - Pentesting Socks. offensive security. deletedomuser Delete domain user querydispinfo Query display info to access through Web; FTP to file upload ==> Execute from web == webshell ; Password Checking if you found with other enum. The following lists commands that you can issue to SAMR, LSARPC, and LSARPC-DS interfaces upon, # You can also use samrdump.py for this purpose, Enumerate trusted domains within an AD forest. lewis S-1-5-21-1835020781-2383529660-3657267081-2002 (User: 1) To enumerate the shares manually you might want to look for responses like NT_STATUS_ACCESS_DENIED and NT_STATUS_BAD_NETWORK_NAME, when using a valid session (e.g. OSCP Enumeration Cheatsheet - CertCube Labs | References: certcube provides a detailed guide of oscp enumeration with step by step oscp enumeration cheatsheet. Replication READ ONLY so lets run rpcclient with no options to see whats available: SegFault:~ cg$ rpcclient [+] User SMB session establishd on [ip] Can try without a password (or sending a blank password) and still potentially connect. Match. samlogon Sam Logon In the demonstration below, the attacker chooses S-1-1-0 SID to enumerate. What script needs to be executed on the user's login? This command will show you the shares on the host, as well as your access to them. Server Message Block in modern language is also known as. | Disclosure date: 2017-03-14 ADMIN$ Disk Remote Admin This is purely my experience with CTFs, Tryhackme, Vulnhub, and Hackthebox prior to enrolling in OSCP. list List available commands on | State: VULNERABLE # download everything recursively in the wwwroot share to /usr/share/smbmap. getdcname Get trusted DC name The command to be used to delete a group using deletedomgroup. Learn. Obviously the SIDS are different but you can still pull down the usernames and start bruteforcing those other open services . 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. | smb-enum-shares: | References: S-1-5-21-1835020781-2383529660-3657267081-1005 LEWISFAMILY\kmem (2)
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