# rpcclient enumeration
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***
### **What is a RID**
A [Relative Identifier (RID)](https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/security-identifiers) is a **unique identifier** (represented in hexadecimal format) utilized by Windows to **track and identify objects**. To explain how this fits in, let's look at the examples below:
* The [SID](https://docs.microsoft.com/en-us/windows/security/identity-protection/access-control/security-identifiers) for the NAME\_DOMAIN.LOCAL domain is: `S-1-5-21-1038751438-1834703946-36937684957`.
* When an object is created within a domain, the number above (SID) will be combined with a RID to make a unique value used to represent the object.
* So the domain user `john` with a RID:\[0x457] Hex 0x457 would = decimal `1111`, will have a full user SID of: `S-1-5-21-1038751438-1834703946-36937684957-1111`.
* This is unique to the `john` 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.
Definition from [**here**](https://academy.hackthebox.com/module/143/section/1269).
### **Enumeration with rpcclient**
The **`rpcclient`** utility from Samba is utilized for interacting with **RPC endpoints through named pipes**. Below commands that can be issued to the SAMR, LSARPC, and LSARPC-DS interfaces after a **SMB session is established**, often necessitating credentials.
#### Server Information
* To obtain **Server Information**: `srvinfo` command is used.
#### Enumeration of Users
* **Users can be listed** using: `querydispinfo` and `enumdomusers`.
* **Details of a user** by: `queryuser <0xrid>`.
* **Groups of a user** with: `queryusergroups <0xrid>`.
* **A user's SID is retrieved** through: `lookupnames `.
* **Aliases of users** by: `queryuseraliases [builtin|domain] `.
```bash
# Users' RIDs-forced
for i in $(seq 500 1100); do
rpcclient -N -U "" [IP_ADDRESS] -c "queryuser 0x$(printf '%x\n' $i)" | grep "User Name\|user_rid\|group_rid" && echo "";
done
# samrdump.py can also serve this purpose
```
#### Enumeration of Groups
* **Groups** by: `enumdomgroups`.
* **Details of a group** with: `querygroup <0xrid>`.
* **Members of a group** through: `querygroupmem <0xrid>`.
#### Enumeration of Alias Groups
* **Alias groups** by: `enumalsgroups `.
* **Members of an alias group** with: `queryaliasmem builtin|domain <0xrid>`.
#### Enumeration of Domains
* **Domains** using: `enumdomains`.
* **A domain's SID is retrieved** through: `lsaquery`.
* **Domain information is obtained** by: `querydominfo`.
#### Enumeration of Shares
* **All available shares** by: `netshareenumall`.
* **Information about a specific share is fetched** with: `netsharegetinfo `.
#### Additional Operations with SIDs
* **SIDs by name** using: `lookupnames `.
* **More SIDs** through: `lsaenumsid`.
* **RID cycling to check more SIDs** is performed by: `lookupsids `.
#### **Extra commands**
| **Command** | **Interface** | **Description** |
| ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
| queryuser | SAMR | Retrieve user information |
| querygroup | Retrieve group information | |
| querydominfo | Retrieve domain information | |
| enumdomusers | Enumerate domain users | |
| enumdomgroups | Enumerate domain groups | |
| createdomuser | Create a domain user | |
| deletedomuser | Delete a domain user | |
| lookupnames | LSARPC | Look up usernames to SID[a](https://learning.oreilly.com/library/view/network-security-assessment/9781491911044/ch08.html#ch08fn8) values |
| lookupsids | Look up SIDs to usernames (RID[b](https://learning.oreilly.com/library/view/network-security-assessment/9781491911044/ch08.html#ch08fn9) cycling) | |
| lsaaddacctrights | Add rights to a user account | |
| lsaremoveacctrights | Remove rights from a user account | |
| dsroledominfo | LSARPC-DS | Get primary domain information |
| dsenumdomtrusts | Enumerate trusted domains within an AD forest | |
To **understand** better how the tools _**samrdump**_ **and** _**rpcdump**_ works you should read [**Pentesting MSRPC**](../135-pentesting-msrpc.md).
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