mirror of
https://github.com/splunk/security_content
synced 2026-06-08 17:32:49 +00:00
acidrain
This commit is contained in:
tccontre
@@ -0,0 +1,86 @@
|
||||
name: Linux deletion Of SSH Key
|
||||
id: 73a56508-1cf5-4df7-b8d9-5737fbdc27d2
|
||||
version: 1
|
||||
date: '2022-04-12'
|
||||
author: Teoderick Contreras, Splunk
|
||||
type: Anomaly
|
||||
datamodel:
|
||||
- Endpoint
|
||||
description: This analytic is to detect a deletion of ssh key in a linux machine.
|
||||
attacker may delete or modify ssh key to impair some security features or act as defense evasion in compromised linux machine.
|
||||
This Anomaly can be also a good indicator of a malware try to wipe or delete several files in compromised host as part of its destructive payload like what
|
||||
acidrain malware does in linux or router machine. This detection can be a good pivot to check what process and user
|
||||
tries to delete this type of files which is not so common and need further investigation.
|
||||
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem
|
||||
where Filesystem.action=deleted Filesystem.file_path = "/etc/ssh/*"
|
||||
by _time span=1h Filesystem.file_name Filesystem.file_path Filesystem.dest Filesystem.process_guid Filesystem.action
|
||||
| `drop_dm_object_name(Filesystem)`
|
||||
|rename process_guid as proc_guid
|
||||
|join proc_guid, _time [
|
||||
| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes where Processes.parent_process_name != unknown
|
||||
by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest Processes.parent_process_name Processes.parent_process Processes.process_path Processes.process_guid
|
||||
| `drop_dm_object_name(Processes)`
|
||||
|rename process_guid as proc_guid
|
||||
| fields _time dest user parent_process_name parent_process process_name process_path process proc_guid registry_path registry_value_name registry_value_data registry_key_name action]
|
||||
| table process_name process proc_guid file_name file_path action _time parent_process_name parent_process process_path dest user
|
||||
| `linux_deletion_of_ssh_key_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, you can use the Add-on for Linux Sysmon from
|
||||
Splunkbase.
|
||||
known_false_positives: Administrator or network operator can execute this command.
|
||||
Please update the filter macros to remove false positives.
|
||||
references:
|
||||
- https://www.sentinelone.com/labs/acidrain-a-modem-wiper-rains-down-on-europe/
|
||||
tags:
|
||||
analytic_story:
|
||||
- Acidrain
|
||||
asset_type: endpoint
|
||||
cis20:
|
||||
- CIS 3
|
||||
- CIS 5
|
||||
- CIS 16
|
||||
confidence: 70
|
||||
context:
|
||||
- Source:Endpoint
|
||||
- Stage:Defense Evasion
|
||||
dataset:
|
||||
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/acidrain/sysmon_linux.log
|
||||
impact: 70
|
||||
kill_chain_phases:
|
||||
- Exploitation
|
||||
message: a $process_name$ deleting a SSH key in $dest$
|
||||
mitre_attack_id:
|
||||
- T1485
|
||||
- T1070.004
|
||||
- T1070
|
||||
nist:
|
||||
- DE.CM
|
||||
observable:
|
||||
- name: dest
|
||||
type: Hostname
|
||||
role:
|
||||
- Victim
|
||||
product:
|
||||
- Splunk Enterprise
|
||||
- Splunk Enterprise Security
|
||||
- Splunk Cloud
|
||||
required_fields:
|
||||
- _time
|
||||
- Filesystem.dest
|
||||
- Filesystem.file_create_time
|
||||
- Filesystem.file_name
|
||||
- Filesystem.process_guid
|
||||
- Filesystem.file_path
|
||||
- Filesystem.action
|
||||
- Processes.dest
|
||||
- Processes.user
|
||||
- Processes.parent_process_name
|
||||
- Processes.parent_process
|
||||
- Processes.process_name
|
||||
- Processes.process_path
|
||||
- Processes.process
|
||||
- Processes.process_id
|
||||
- Processes.parent_process_id
|
||||
risk_score: 49
|
||||
security_domain: endpoint
|
||||
@@ -0,0 +1,86 @@
|
||||
name: Linux Deletion of SSL Certificate
|
||||
id: 839ab790-a60a-4f81-bfb3-02567063f615
|
||||
version: 1
|
||||
date: '2022-04-12'
|
||||
author: Teoderick Contreras, Splunk
|
||||
type: Anomaly
|
||||
datamodel:
|
||||
- Endpoint
|
||||
description: This analytic is to detect a deletion of ssl certificate in a linux machine.
|
||||
attacker may delete or modify ssl certificate to impair some security features or act as defense evasion in compromised linux machine.
|
||||
This Anomaly can be also a good indicator of a malware try to wipe or delete several files in compromised host as part of its destructive payload like what
|
||||
acidrain malware does in linux or router machine. This detection can be a good pivot to check what process and user
|
||||
tries to delete this type of files which is not so common and need further investigation.
|
||||
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Filesystem
|
||||
where Filesystem.action=deleted Filesystem.file_path = "/etc/ssl/certs/*" Filesystem.file_path IN ("*.pem", "*.crt")
|
||||
by _time span=1h Filesystem.file_name Filesystem.file_path Filesystem.dest Filesystem.process_guid Filesystem.action
|
||||
| `drop_dm_object_name(Filesystem)`
|
||||
|rename process_guid as proc_guid
|
||||
|join proc_guid, _time [
|
||||
| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes where Processes.parent_process_name != unknown
|
||||
by _time span=1h Processes.process_id Processes.process_name Processes.process Processes.dest Processes.parent_process_name Processes.parent_process Processes.process_path Processes.process_guid
|
||||
| `drop_dm_object_name(Processes)`
|
||||
|rename process_guid as proc_guid
|
||||
| fields _time dest user parent_process_name parent_process process_name process_path process proc_guid registry_path registry_value_name registry_value_data registry_key_name action]
|
||||
| table process_name process proc_guid file_name file_path action _time parent_process_name parent_process process_path dest user
|
||||
| `linux_deletion_of_ssl_certificate_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, you can use the Add-on for Linux Sysmon from
|
||||
Splunkbase.
|
||||
known_false_positives: Administrator or network operator can execute this command.
|
||||
Please update the filter macros to remove false positives.
|
||||
references:
|
||||
- https://www.sentinelone.com/labs/acidrain-a-modem-wiper-rains-down-on-europe/
|
||||
tags:
|
||||
analytic_story:
|
||||
- Acidrain
|
||||
asset_type: endpoint
|
||||
cis20:
|
||||
- CIS 3
|
||||
- CIS 5
|
||||
- CIS 16
|
||||
confidence: 70
|
||||
context:
|
||||
- Source:Endpoint
|
||||
- Stage:Defense Evasion
|
||||
dataset:
|
||||
- https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/acidrain/sysmon_linux.log
|
||||
impact: 70
|
||||
kill_chain_phases:
|
||||
- Exploitation
|
||||
message: a $process_name$ deleting a SSL certificate in $dest$
|
||||
mitre_attack_id:
|
||||
- T1485
|
||||
- T1070.004
|
||||
- T1070
|
||||
nist:
|
||||
- DE.CM
|
||||
observable:
|
||||
- name: dest
|
||||
type: Hostname
|
||||
role:
|
||||
- Victim
|
||||
product:
|
||||
- Splunk Enterprise
|
||||
- Splunk Enterprise Security
|
||||
- Splunk Cloud
|
||||
required_fields:
|
||||
- _time
|
||||
- Filesystem.dest
|
||||
- Filesystem.file_create_time
|
||||
- Filesystem.file_name
|
||||
- Filesystem.process_guid
|
||||
- Filesystem.file_path
|
||||
- Filesystem.action
|
||||
- Processes.dest
|
||||
- Processes.user
|
||||
- Processes.parent_process_name
|
||||
- Processes.parent_process
|
||||
- Processes.process_name
|
||||
- Processes.process_path
|
||||
- Processes.process
|
||||
- Processes.process_id
|
||||
- Processes.parent_process_id
|
||||
risk_score: 49
|
||||
security_domain: endpoint
|
||||
@@ -0,0 +1,12 @@
|
||||
name: Linux deletion Of SSH Key Unit Test
|
||||
tests:
|
||||
- name: Linux deletion Of SSH Key
|
||||
file: endpoint/linux_deletion_of_ssh_key.yml
|
||||
pass_condition: '| stats count | where count > 0'
|
||||
earliest_time: -24h
|
||||
latest_time: now
|
||||
attack_data:
|
||||
- file_name: sysmon_linux.log
|
||||
data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/acidrain/sysmon_linux.log
|
||||
source: Syslog:Linux-Sysmon/Operational
|
||||
sourcetype: sysmon_linux
|
||||
@@ -0,0 +1,12 @@
|
||||
name: Linux Deletion of SSL Certificate Unit Test
|
||||
tests:
|
||||
- name: Linux Deletion of SSL Certificate
|
||||
file: endpoint/linux_deletion_of_ssl_certificate.yml
|
||||
pass_condition: '| stats count | where count > 0'
|
||||
earliest_time: -24h
|
||||
latest_time: now
|
||||
attack_data:
|
||||
- file_name: sysmon_linux.log
|
||||
data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/malware/acidrain/sysmon_linux.log
|
||||
source: Syslog:Linux-Sysmon/Operational
|
||||
sourcetype: sysmon_linux
|
||||
Reference in New Issue
Block a user