mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Michael Haag
99 lines
3.4 KiB
YAML
99 lines
3.4 KiB
YAML
name: Detect PsExec With accepteula Flag
|
|
id: 27c3a83d-cada-47c6-9042-67baf19d2574
|
|
version: 4
|
|
date: '2021-09-16'
|
|
author: Bhavin Patel, Splunk
|
|
type: TTP
|
|
datamodel:
|
|
- Endpoint
|
|
description: This search looks for events where `PsExec.exe` is run with the `accepteula`
|
|
flag in the command line. PsExec is a built-in Windows utility that enables you
|
|
to execute processes on other systems. It is fully interactive for console applications.
|
|
This tool is widely used for launching interactive command prompts on remote systems.
|
|
Threat actors leverage this extensively for executing code on compromised systems.
|
|
If an attacker is running PsExec for the first time, they will be prompted to accept
|
|
the end-user license agreement (EULA), which can be passed as the argument `accepteula`
|
|
within the command line.
|
|
search: '| tstats `security_content_summariesonly` values(Processes.process) as process
|
|
min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes
|
|
where `process_psexec` Processes.process=*accepteula* by Processes.dest Processes.user
|
|
Processes.parent_process_name Processes.process_name Processes.process Processes.process_id
|
|
Processes.parent_process_id | `drop_dm_object_name(Processes)`| `security_content_ctime(firstTime)`|
|
|
`security_content_ctime(lastTime)` | `detect_psexec_with_accepteula_flag_filter`'
|
|
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: Administrators can leverage PsExec for accessing remote systems
|
|
and might pass `accepteula` as an argument if they are running this tool for the
|
|
first time. However, it is not likely that you'd see multiple occurrences of this
|
|
event on a machine
|
|
references: []
|
|
tags:
|
|
analytic_story:
|
|
- SamSam Ransomware
|
|
- DHS Report TA18-074A
|
|
- HAFNIUM Group
|
|
- DarkSide Ransomware
|
|
- Active Directory Lateral Movement
|
|
- CISA AA22-320A
|
|
asset_type: Endpoint
|
|
cis20:
|
|
- CIS 8
|
|
confidence: 70
|
|
context:
|
|
- Source:Endpoint
|
|
- Stage:Execution
|
|
dataset:
|
|
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1021.002/atomic_red_team/windows-sysmon.log
|
|
impact: 50
|
|
kill_chain_phases:
|
|
- Actions on Objectives
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$ by user $user$ running the utility for possibly the first time.
|
|
mitre_attack_id:
|
|
- T1021
|
|
- T1021.002
|
|
nist:
|
|
- PR.PT
|
|
- DE.CM
|
|
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
|
|
required_fields:
|
|
- _time
|
|
- Processes.dest
|
|
- Processes.user
|
|
- Processes.parent_process_name
|
|
- Processes.parent_process
|
|
- Processes.original_file_name
|
|
- Processes.process_name
|
|
- Processes.process
|
|
- Processes.process_id
|
|
- Processes.parent_process_path
|
|
- Processes.process_path
|
|
- Processes.parent_process_id
|
|
risk_score: 35
|
|
security_domain: endpoint
|
|
supported_tas:
|
|
- Splunk_TA_microsoft_sysmon
|