mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
Eric McGinnis
85 lines
5.0 KiB
YAML
85 lines
5.0 KiB
YAML
name: Linux Java Spawning Shell
|
|
id: 7b09db8a-5c20-11ec-9945-acde48001122
|
|
version: 10
|
|
creation_date: '2021-12-13'
|
|
modification_date: '2026-05-13'
|
|
author: Michael Haag, Splunk
|
|
status: removed
|
|
type: TTP
|
|
description: The following analytic detects instances where Java, or Tomcat processes spawn a Linux shell, which may indicate exploitation attempts, such as those related to CVE-2021-44228 (Log4Shell). This detection leverages Endpoint Detection and Response (EDR) telemetry, focusing on process names and parent-child process relationships. This activity is significant as it can signify a compromised Java application, potentially leading to unauthorized shell access. If confirmed malicious, attackers could execute arbitrary commands, escalate privileges, or maintain persistent access, posing a severe threat to the environment.
|
|
data_source:
|
|
- Sysmon for Linux EventID 1
|
|
search: |
|
|
| tstats `security_content_summariesonly`
|
|
count min(_time) as firstTime
|
|
max(_time) as lastTime
|
|
|
|
from datamodel=Endpoint.Processes where
|
|
|
|
Processes.parent_process_name IN ("java", "tomcat")
|
|
`linux_shells`
|
|
|
|
by Processes.action Processes.dest Processes.original_file_name Processes.parent_process
|
|
Processes.parent_process_exec Processes.parent_process_guid Processes.parent_process_id
|
|
Processes.parent_process_name Processes.parent_process_path Processes.process Processes.process_exec
|
|
Processes.process_guid Processes.process_hash Processes.process_id Processes.process_integrity_level
|
|
Processes.process_name Processes.process_path Processes.user Processes.user_id Processes.vendor_product
|
|
|
|
| `drop_dm_object_name(Processes)`
|
|
| `security_content_ctime(firstTime)`
|
|
| `security_content_ctime(lastTime)`
|
|
| `linux_java_spawning_shell_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: Filtering may be required on internal developer build systems or classify assets as web facing and restrict the analytic based on asset type.
|
|
references:
|
|
- https://blog.netlab.360.com/ten-families-of-malicious-samples-are-spreading-using-the-log4j2-vulnerability-now/
|
|
- https://gist.github.com/olafhartong/916ebc673ba066537740164f7e7e1d72
|
|
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: An instance of $parent_process_name$ spawning $process_name$ was identified on endpoint $dest$ spawning a Linux shell, potentially indicative of exploitation.
|
|
risk_objects:
|
|
- field: dest
|
|
type: system
|
|
score: 40
|
|
threat_objects:
|
|
- field: parent_process_name
|
|
type: parent_process_name
|
|
- field: process_name
|
|
type: process_name
|
|
tags:
|
|
analytic_story:
|
|
- Data Destruction
|
|
- Spring4Shell CVE-2022-22965
|
|
- Hermetic Wiper
|
|
- Log4Shell CVE-2021-44228
|
|
asset_type: Endpoint
|
|
cve:
|
|
- CVE-2021-44228
|
|
mitre_attack_id:
|
|
- T1190
|
|
- T1133
|
|
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/attack_techniques/T1190/java/java_spawn_shell_nix.log
|
|
source: Syslog:Linux-Sysmon/Operational
|
|
sourcetype: sysmon:linux
|
|
deprecation_info:
|
|
reason: Detection has been deprecated in favor of a more broad and generic logic that aims to reduce overhead and increase coverage.
|
|
removed_in_version: 5.20.0
|
|
replacement_content:
|
|
- Web or Application Server Spawning a Shell
|