mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric
94 lines
4.8 KiB
YAML
94 lines
4.8 KiB
YAML
name: Excessive Usage Of Taskkill
|
|
id: fe5bca48-accb-11eb-a67c-acde48001122
|
|
version: 8
|
|
date: '2025-05-02'
|
|
author: Teoderick Contreras, Splunk
|
|
status: production
|
|
type: Anomaly
|
|
description: The following analytic identifies excessive usage of `taskkill.exe`,
|
|
a command-line utility used to terminate processes. The detection leverages data
|
|
from Endpoint Detection and Response (EDR) agents, focusing on instances where `taskkill.exe`
|
|
is executed ten or more times within a one-minute span. This behavior is significant
|
|
as adversaries often use `taskkill.exe` to disable security tools or other critical
|
|
processes to evade detection. If confirmed malicious, this activity could allow
|
|
attackers to bypass security defenses, maintain persistence, and further compromise
|
|
the system.
|
|
data_source:
|
|
- Sysmon EventID 1
|
|
- Windows Event Log Security 4688
|
|
- CrowdStrike ProcessRollup2
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime values(Processes.action) as action values(Processes.dest) as dest values(Processes.original_file_name)
|
|
as original_file_name values(Processes.parent_process) as parent_process values(Processes.parent_process_exec)
|
|
as parent_process_exec values(Processes.parent_process_guid) as parent_process_guid
|
|
values(Processes.parent_process_id) as parent_process_id values(Processes.parent_process_path)
|
|
as parent_process_path values(Processes.process) as process values(Processes.process_exec)
|
|
as process_exec values(Processes.process_guid) as process_guid values(Processes.process_hash)
|
|
as process_hash values(Processes.process_id) as process_id values(Processes.process_integrity_level)
|
|
as process_integrity_level values(Processes.process_path) as process_path values(Processes.user)
|
|
as user values(Processes.user_id) as user_id values(Processes.vendor_product) as
|
|
vendor_product from datamodel=Endpoint.Processes where Processes.process_name =
|
|
"taskkill.exe" by Processes.parent_process_name Processes.process_name Processes.dest
|
|
Processes.user _time span=1m | where count >=10 | `drop_dm_object_name(Processes)`
|
|
| `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `excessive_usage_of_taskkill_filter`'
|
|
how_to_implement: The detection is based on data that originates from Endpoint Detection
|
|
and Response (EDR) agents. These agents are designed to provide security-related
|
|
telemetry from the endpoints where the agent is installed. To implement this search,
|
|
you must ingest logs that contain the process GUID, process name, and parent process.
|
|
Additionally, you must ingest complete command-line executions. These logs must
|
|
be processed using the appropriate Splunk Technology Add-ons that are specific to
|
|
the EDR product. The logs must also be mapped to the `Processes` node of the `Endpoint`
|
|
data model. Use the Splunk Common Information Model (CIM) to normalize the field
|
|
names and speed up the data modeling process.
|
|
known_false_positives: Unknown. Filter as needed.
|
|
references:
|
|
- https://thedfirreport.com/2020/04/20/sqlserver-or-the-miner-in-the-basement/
|
|
- https://www.joesandbox.com/analysis/702680/0/html
|
|
drilldown_searches:
|
|
- name: View the detection results for - "$dest$"
|
|
search: '%original_detection_search% | search dest = "$dest$"'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
- name: View risk events for the last 7 days for - "$dest$"
|
|
search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$")
|
|
starthoursago=168 | stats count min(_time) as firstTime max(_time) as lastTime
|
|
values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories)
|
|
as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic)
|
|
as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)`'
|
|
earliest_offset: $info_min_time$
|
|
latest_offset: $info_max_time$
|
|
rba:
|
|
message: Excessive usage of taskkill.exe with process id $process_id$ (more than
|
|
10 within 1m) has been detected on $dest$ with a parent process of $parent_process_name$.
|
|
risk_objects:
|
|
- field: dest
|
|
type: system
|
|
score: 28
|
|
threat_objects:
|
|
- field: parent_process_name
|
|
type: parent_process_name
|
|
tags:
|
|
analytic_story:
|
|
- Azorult
|
|
- AgentTesla
|
|
- CISA AA22-277A
|
|
- NjRAT
|
|
- CISA AA22-264A
|
|
- XMRig
|
|
- Crypto Stealer
|
|
asset_type: Endpoint
|
|
mitre_attack_id:
|
|
- T1562.001
|
|
product:
|
|
- Splunk Enterprise
|
|
- Splunk Enterprise Security
|
|
- Splunk Cloud
|
|
security_domain: endpoint
|
|
tests:
|
|
- name: True Positive Test
|
|
attack_data:
|
|
- data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/xmrig_miner/windows-sysmon.log
|
|
source: XmlWinEventLog:Microsoft-Windows-Sysmon/Operational
|
|
sourcetype: XmlWinEventLog
|