User Added to Remote Desktop Users Group

 1title: User Added to Remote Desktop Users Group
 2id: ffa28e60-bdb1-46e0-9f82-05f7a61cc06e
 3related:
 4    - id: ad720b90-25ad-43ff-9b5e-5c841facc8e5 # Admin groups
 5      type: similar
 6    - id: 10fb649c-3600-4d37-b1e6-56ea90bb7e09 # Privileged groups
 7      type: similar
 8status: test
 9description: Detects addition of users to the local Remote Desktop Users group via "Net" or "Add-LocalGroupMember".
10references:
11    - https://www.microsoft.com/security/blog/2021/11/16/evolving-trends-in-iranian-threat-actor-activity-mstic-presentation-at-cyberwarcon-2021/
12author: Florian Roth (Nextron Systems)
13date: 2021-12-06
14modified: 2022-09-09
15tags:
16    - attack.initial-access
17    - attack.persistence
18    - attack.lateral-movement
19    - attack.t1133
20    - attack.t1136.001
21    - attack.t1021.001
22logsource:
23    category: process_creation
24    product: windows
25detection:
26    selection_main:
27        - CommandLine|contains|all:
28              - 'localgroup '
29              - ' /add'
30        - CommandLine|contains|all:
31              - 'Add-LocalGroupMember '
32              - ' -Group '
33    selection_group:
34        CommandLine|contains:
35            - 'Remote Desktop Users'
36            - 'Utilisateurs du Bureau à distance' # French for "Remote Desktop Users"
37            - 'Usuarios de escritorio remoto' # Spanish for "Remote Desktop Users"
38    condition: all of selection_*
39falsepositives:
40    - Administrative activity
41level: high