title: Possible DCSync Attack
id: 56fda488-113e-4ce9-8076-afc2457922c3
description: Detects remote RPC calls to MS-DRSR from non DC hosts, which could indicate DCSync / DCShadow attacks.
references:
    - https://attack.mitre.org/techniques/T1033/
    - https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-drsr/f977faaa-673e-4f66-b9bf-48c640241d47?redirectedfrom=MSDN
    - https://github.com/jsecurity101/MSRPC-to-ATTACK/blob/main/documents/MS-DRSR.md
    - https://github.com/zeronetworks/rpcfirewall
    - https://zeronetworks.com/blog/stopping_lateral_movement_via_the_rpc_firewall/
tags:
    - attack.t1033
status: experimental
author: Sagie Dulce, Dekel Paz
date: 2022/01/01
modified: 2022/01/01
logsource:
    product: rpc_firewall
    category: application
    definition: 'Requirements: install and apply the RPC Firewall to all processes, enable DRSR UUID (e3514235-4b06-11d1-ab04-00c04fc2dcd2) for "dangerous" opcodes (not 0,1 or 12) only from trusted IPs (DCs)'
detection:
    selection:
        EventLog: RPCFW
        EventID: 3
        InterfaceUuid: e3514235-4b06-11d1-ab04-00c04fc2dcd2
    filter:
      OpNum:
        - 0
        - 1
        - 12
    condition: selection and not filter
falsepositives:
    - Unknown
level: high