Added detection testing service results inAuto Admin Logon Registry Entry

This commit is contained in:
root
2021-09-07 07:47:09 +00:00
parent 73ec31d559
commit 7dbd2e82bc
@@ -6,23 +6,25 @@ author: Teoderick Contreras, Splunk
type: TTP
datamodel:
- Endpoint
description: this search is to detect a suspicious registry modification to implement auto admin logon to a host.
This technique was seen in BlackMatter ransomware to automatically logon to the compromise host after triggering a safemode boot to continue encrypting the whole network.
This behavior is not a common practice and really a suspicious TTP or alert need to be consider if found within then network premise.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry
where Registry.registry_path= "*SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Winlogon*" AND Registry.registry_key_name=AutoAdminLogon AND Registry.registry_value_name=1
by Registry.registry_path Registry.registry_key_name Registry.registry_value_name Registry.dest
| `drop_dm_object_name(Registry)`
| `security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)`
| `auto_admin_logon_registry_entry_filter`'
description: this search is to detect a suspicious registry modification to implement
auto admin logon to a host. This technique was seen in BlackMatter ransomware to
automatically logon to the compromise host after triggering a safemode boot to
continue encrypting the whole network. This behavior is not a common practice and
really a suspicious TTP or alert need to be consider if found within then network
premise.
search: '| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time)
as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*SOFTWARE\\Microsoft\\Windows
NT\\CurrentVersion\\Winlogon*" AND Registry.registry_key_name=AutoAdminLogon AND
Registry.registry_value_name=1 by Registry.registry_path Registry.registry_key_name
Registry.registry_value_name Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)` | `auto_admin_logon_registry_entry_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 `Registry` node. Also make sure
that this registry was included in your config files ex. sysmon config to be monitored.
known_false_positives: unknown
references:
- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/
- https://news.sophos.com/en-us/2021/08/09/blackmatter-ransomware-emerges-from-the-shadow-of-darkside/
tags:
analytic_story:
- BlackMatter Ransomware
@@ -38,22 +40,22 @@ tags:
- Splunk Cloud
required_fields:
- _time
- Registry.registry_path
- Registry.registry_key_name
- Registry.registry_value_name
- Registry.dest
- Registry.registry_path
- Registry.registry_key_name
- Registry.registry_value_name
- Registry.dest
security_domain: endpoint
impact: 70
confidence: 90
# (impact * confidence)/100
risk_score: 63
context:
context:
- Source:Endpoint
- Stage:Credential Access
message: modified registry key $registry_key_name$ with registry value $registry_value_name$ to prepare autoadminlogon
observable:
message: modified registry key $registry_key_name$ with registry value $registry_value_name$
to prepare autoadminlogon
observable:
- name: dest
type: Endpoint
role:
- Victim
automated_detection_testing: passed