rpcclient enumeration

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Overview of Relative Identifiers (RID) and Security Identifiers (SID)

Relative Identifiers (RID) and Security Identifiers (SID) are key components in Windows operating systems for uniquely identifying and managing objects, such as users and groups, within a network domain.

SIDs serve as unique identifiers for domains, ensuring that each domain is distinguishable.
RIDs are appended to SIDs to create unique identifiers for objects within those domains. This combination allows for precise tracking and management of object permissions and access controls.

For instance, a user named pepe might have a unique identifier combining the domain's SID with his specific RID, represented in both hexadecimal (0x457) and decimal (1111) formats. This results in a complete and unique identifier for pepe within the domain like: S-1-5-21-1074507654-1937615267-42093643874-1111.

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 <username>.
Aliases of users by: queryuseraliases [builtin|domain] <sid>.

# 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 <builtin|domain>.
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 <share>.

Additional Operations with SIDs

SIDs by name using: lookupnames <username>.
More SIDs through: lsaenumsid.
RID cycling to check more SIDs is performed by: lookupsids <sid>.

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 SIDa values
lookupsids	Look up SIDs to usernames (RIDb 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.