Techniques
Sample rules
Detect Remote Access Software Usage Registry
- source: splunk
- technicques:
- T1219
Description
The following analytic detects when a known remote access software is added to common persistence locations on a device within the environment. Adversaries use these utilities to retain remote access capabilities to the environment. Utilities in the lookup include AnyDesk, GoToMyPC, LogMeIn, TeamViewer and much more. Review the lookup for the entire list and add any others.
Detection logic
| tstats `security_content_summariesonly` latest(Registry.process_guid) as process_guid count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Endpoint.Registry where (Registry.registry_path="*\\Microsoft\\Windows\\CurrentVersion\\Run*" OR (Registry.registry_path="*\\SYSTEM\\CurrentControlSet\\Services\\*" AND Registry.registry_value_name="ImagePath")) by Registry.action Registry.dest Registry.process_guid Registry.process_id Registry.registry_hive Registry.registry_path Registry.registry_key_name Registry.registry_value_data Registry.registry_value_name Registry.registry_value_type Registry.status Registry.user Registry.vendor_product
| `drop_dm_object_name(Registry)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| rex field=registry_value_data "(\")?.+\\\(?<file_name_1>[^\"=]+\.[^\" ]{1,5})(\")?"
| rex field=registry_value_data "(?<file_name_2>[^\.]+\.[^\" ]{1,5}$)"
| eval file_name = coalesce(file_name_1,file_name_2)
| lookup remote_access_software remote_utility AS file_name OUTPUT isutility, description as signature, comment_reference as desc, category
| search isutility = TRUE
| `remote_access_software_usage_exceptions`
| `detect_remote_access_software_usage_registry_filter`
Detect Remote Access Software Usage File
- source: splunk
- technicques:
- T1219
Description
The following analytic detects the writing of files from known remote access software to disk within the environment. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on file path, file name, and user information. This activity is significant as adversaries often use remote access tools like AnyDesk, GoToMyPC, LogMeIn, and TeamViewer to maintain unauthorized access. If confirmed malicious, this could allow attackers to persist in the environment, potentially leading to data exfiltration, further compromise, or complete control over affected systems.
Detection logic
| tstats `security_content_summariesonly` count, min(_time) as firstTime, max(_time) as lastTime, values(Filesystem.file_path) as file_path from datamodel=Endpoint.Filesystem by Filesystem.action Filesystem.dest Filesystem.file_access_time Filesystem.file_create_time Filesystem.file_hash Filesystem.file_modify_time Filesystem.file_name Filesystem.file_path Filesystem.file_acl Filesystem.file_size Filesystem.process_guid Filesystem.process_id Filesystem.user Filesystem.vendor_product
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| `drop_dm_object_name(Filesystem)`
| lookup remote_access_software remote_utility AS file_name OUTPUT isutility, description as signature, comment_reference as desc, category
| search isutility = TRUE
| `remote_access_software_usage_exceptions`
| `detect_remote_access_software_usage_file_filter`
Detect Remote Access Software Usage FileInfo
- source: splunk
- technicques:
- T1219
Description
The following analytic detects the execution of processes with file or code signing attributes from known remote access software within the environment. It leverages Sysmon EventCode 1 data and cross-references a lookup table of remote access utilities such as AnyDesk, GoToMyPC, LogMeIn, and TeamViewer. This activity is significant as adversaries often use these tools to maintain unauthorized remote access. If confirmed malicious, this could allow attackers to persist in the environment, potentially leading to data exfiltration or further compromise of the network.
Detection logic
`sysmon` EventCode=1
| stats count min(_time) as firstTime max(_time) as lastTime, values(Company) as Company values(Product) as Product by action dest original_file_name parent_process parent_process_exec parent_process_guid parent_process_id parent_process_name parent_process_path process process_exec process_guid process_hash process_id process_integrity_level process_name process_path user user_id vendor_product
| lookup remote_access_software remote_utility_fileinfo AS Product OUTPUT isutility, description as signature, comment_reference as desc, category
| search isutility = True
| `remote_access_software_usage_exceptions`
| `detect_remote_access_software_usage_fileinfo_filter`