name: CMD Echo Pipe - Escalation
id: eb277ba0-b96b-11eb-b00e-acde48001122
version: 2
date: '2021-05-20'
author: Michael Haag, Splunk
status: production
type: TTP
description: This analytic identifies a common behavior by Cobalt Strike and other
  frameworks where the adversary will escalate privileges, either via `jump` (Cobalt
  Strike PTH) or `getsystem`, using named-pipe impersonation. A suspicious event will
  look like `cmd.exe /c echo 4sgryt3436 > \\.\Pipe\5erg53`.
data_source:
- Sysmon Event ID 1
search:
  selection1:
    OriginalFileName: Cmd.Exe
  selection2:
    Image|endswith: cmd.exe
  selection3:
    CommandLine: '*%comspec%*'
  selection4:
    CommandLine: '*pipe*'
  selection5:
    CommandLine: '*echo*'
  condition: (selection1 or selection2) or selection3 or selection4 or selection5
how_to_implement: To successfully implement this search you need to be ingesting information
  on process that include the name of the process responsible for the changes from
  your endpoints into the `Endpoint` datamodel in the `Processes` node. In addition,
  confirm the latest CIM App 4.20 or higher is installed and the latest TA for the
  endpoint product.
known_false_positives: Unknown. It is possible filtering may be required to ensure
  fidelity.
references:
- https://redcanary.com/threat-detection-report/threats/cobalt-strike/
- https://github.com/rapid7/meterpreter/blob/master/source/extensions/priv/server/elevate/namedpipe.c
tags:
  analytic_story:
  - Cobalt Strike
  asset_type: Endpoint
  confidence: 80
  impact: 80
  message: An instance of $parent_process_name$ spawning $process_name$ was identified
    on endpoint $dest$ by user $user$ potentially performing privilege escalation
    using named pipes related to Cobalt Strike and other frameworks.
  mitre_attack_id:
  - T1059
  - T1059.003
  - T1543.003
  - T1543
  observable:
  - name: user
    type: User
    role:
    - Victim
  - name: dest
    type: Hostname
    role:
    - Victim
  - name: parent_process_name
    type: Process
    role:
    - Parent Process
  - name: process_name
    type: Process
    role:
    - Child Process
  product:
  - Splunk Enterprise
  - Splunk Enterprise Security
  - Splunk Cloud
  risk_score: 64
  security_domain: endpoint
tests:
- name: True Positive Test
  attack_data:
  - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1055/cobalt_strike/windows-sysmon.log
    source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
    sourcetype: xmlwineventlog