mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
tccontre
85 lines
3.3 KiB
YAML
85 lines
3.3 KiB
YAML
name: Linux Java Spawning Shell
|
|
id: 7b09db8a-5c20-11ec-9945-acde48001122
|
|
version: 1
|
|
date: '2023-04-14'
|
|
author: Michael Haag, Splunk
|
|
status: production
|
|
type: TTP
|
|
description: The following analytic identifies the process name of Java, Apache, or
|
|
Tomcat spawning a Linux shell. This is potentially indicative of exploitation of
|
|
the Java application and may be related to current event CVE-2021-44228 (Log4Shell).
|
|
The shells included in the macro are "sh", "ksh", "zsh", "bash", "dash", "rbash",
|
|
"fish", "csh', "tcsh', "ion", "eshell". Upon triage, review parallel processes and
|
|
command-line arguments to determine legitimacy.
|
|
data_source:
|
|
- Sysmon Event ID 1
|
|
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
|
|
as lastTime from datamodel=Endpoint.Processes where Processes.parent_process_name=java
|
|
OR Processes.parent_process_name=apache OR Processes.parent_process_name=tomcat
|
|
`linux_shells` 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)` | `linux_java_spawning_shell_filter`'
|
|
how_to_implement: To successfully implement this search, you need to be ingesting
|
|
logs with the process name, parent process, and command-line executions from your
|
|
endpoints. If you are using Sysmon for Linux, you will need to ensure mapping is
|
|
occurring correctly. Ensure EDR product is mapping OS Linux to the datamodel properly.
|
|
Add any additional java process names for your environment to the analytic as needed.
|
|
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
|
|
tags:
|
|
analytic_story:
|
|
- Data Destruction
|
|
- Spring4Shell CVE-2022-22965
|
|
- Hermetic Wiper
|
|
- Log4Shell CVE-2021-44228
|
|
asset_type: Endpoint
|
|
confidence: 50
|
|
cve:
|
|
- CVE-2021-44228
|
|
impact: 80
|
|
message: An instance of $parent_process_name$ spawning $process_name$ was identified
|
|
on endpoint $dest$ spawning a Linux shell, potentially indicative of exploitation.
|
|
mitre_attack_id:
|
|
- T1190
|
|
observable:
|
|
- 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: 40
|
|
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
|