MITRE BZAR Indicators for Execution — Sigma Rule

Rule metadata and linked tags

Author: @neu5ron, SOC Prime. Source status: test; severity: medium. Source dates: 2020-03-19 / 2021-11-27.

{
  "product": "zeek",
  "service": "dce_rpc"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 646105feda93cc38ba114e137150b7623758a005fc367ad27aff4cff7bbf29ed

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: MITRE BZAR Indicators for Execution
id: b640c0b8-87f8-4daa-aef8-95a24261dd1d
status: test
description: 'Windows DCE-RPC functions which indicate an execution techniques on the remote system. All credit for the Zeek mapping of the suspicious endpoint/operation field goes to MITRE'
references:
    - https://github.com/mitre-attack/bzar#indicators-for-attck-execution
author: '@neu5ron, SOC Prime'
date: 2020-03-19
modified: 2021-11-27
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.t1047
    - attack.t1053.002
    - attack.t1569.002
logsource:
    product: zeek
    service: dce_rpc
detection:
    op1:
        endpoint: 'JobAdd'
        operation: 'atsvc'
    op2:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcEnableTask'
    op3:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcRegisterTask'
    op4:
        endpoint: 'ITaskSchedulerService'
        operation: 'SchRpcRun'
    op5:
        endpoint: 'IWbemServices'
        operation: 'ExecMethod'
    op6:
        endpoint: 'IWbemServices'
        operation: 'ExecMethodAsync'
    op7:
        endpoint: 'svcctl'
        operation: 'CreateServiceA'
    op8:
        endpoint: 'svcctl'
        operation: 'CreateServiceW'
    op9:
        endpoint: 'svcctl'
        operation: 'StartServiceA'
    op10:
        endpoint: 'svcctl'
        operation: 'StartServiceW'
    condition: 1 of op*
falsepositives:
    - Windows administrator tasks or troubleshooting
    - Windows management scripts or software
level: medium

Original YAML and metadata in JSON

False positives

• Windows administrator tasks or troubleshooting
• Windows management scripts or software

Source references

• https://github.com/mitre-attack/bzar#indicators-for-attck-execution