This analytic detects a potential suspicious modification of firewall rule registry allowing inbound traffic in specific port with public profile. This technique was identified when an adversary wants to grant remote access to a machine by allowing the traffic in a firewall rule.
- Type: TTP
- Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud
- Datamodel: Endpoint
- Last Updated: 2021-05-26
- Author: Teoderick Contreras, Splunk
- ID: 0a46537c-be02-11eb-92ca-acde48001122
|T1021.001||Remote Desktop Protocol||Lateral Movement|
|T1021||Remote Services||Lateral Movement|
| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Registry where Registry.registry_path= "*\\System\\CurrentControlSet\\Services\\SharedAccess\\Parameters\\FirewallPolicy\\FirewallRules\\*" Registry.registry_value_name = "* |Action=Allow |*" Registry.registry_value_name = "* |Dir=In |*" Registry.registry_value_name = "* |Profile=Public |*" Registry.registry_value_name = "* |LPort=*" by Registry.registry_path Registry.registry_key_name Registry.user Registry.registry_value_name Registry.dest | `drop_dm_object_name(Registry)` | `security_content_ctime(firstTime)` |`security_content_ctime(lastTime)` | `allow_inbound_traffic_by_firewall_rule_registry_filter`
Associated Analytic Story
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.
Kill Chain Phase
Known False Positives
network admin may add/remove/modify public inbound firewall rule that may cause this rule to be triggered.
|3.0||10||30||Suspicious firewall modifications were detected via the registry on endpoint $dest$ by user $user$.|
source | version: 1