administrator may modify or delete firewall configuration.

Techniques

T1562.004

Sample rules

Windows Delete or Modify System Firewall

source: splunk
technicques:
- T1562.004

Description

The following analytic identifies ’netsh’ processes that delete or modify firewall configurations. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on command-line executions containing specific keywords. This activity is significant because it can indicate malware, such as NJRAT, attempting to alter firewall settings to evade detection or remove traces. If confirmed malicious, this behavior could allow an attacker to disable security measures, facilitating further compromise and persistence within the network.

Detection logic


| tstats `security_content_summariesonly` count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Processes
  WHERE `process_netsh` Processes.process = "* firewall *" Processes.process = "* del*"
  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)`

| `windows_delete_or_modify_system_firewall_filter`