Techniques
Sample rules
Cisco NVM - Rclone Execution With Network Activity
- source: splunk
- technicques:
- T1567.002
Description
This detection identifies execution of the file synchronization utility “rclone”. It leverages Cisco Network Visibility Module logs, specifically flow data in order to capture process executions initiating network connections. While rclone is a legitimate command-line tool for syncing data to cloud storage providers, it has been widely abused by threat actors for data exfiltration. This analytic inspects process name and arguments for rclone and flags usage of suspicious flags. If matched, this could indicate malicious usage for stealthy data exfiltration or cloud abuse.
Detection logic
`cisco_network_visibility_module_flowdata`
(
process_name = "rclone.exe"
OR
(
process_arguments = "* copy *"
process_arguments = "*\\\\*"
process_arguments IN ("*remote:*", "*mega:*", "*ftp:*", "*ftp1:*")
)
OR
(
process_arguments IN ("*remote:*", "*mega:*", "*ftp:*", "*ftp1:*")
process_arguments = "*--transfers"
process_arguments = "*--ignore-existing*"
process_arguments = "*--auto-confirm*"
)
)
| stats count min(_time) as firstTime max(_time) as lastTime
values(parent_process_arguments) as parent_process_arguments
values(process_arguments) as process_arguments
values(parent_process_hash) as parent_process_hash
values(process_hash) as process_hash
values(module_name_list) as module_name_list
values(module_hash_list) as module_hash_list
values(dest_port) as dest_port
values(aliul) as additional_logged_in_users_list
values(dest_hostname) as dest_hostname
by src dest parent_process_path parent_process_integrity_level process_path process_name process_integrity_level process_id transport
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)`
| table
parent_process_integrity_level parent_process_path parent_process_arguments parent_process_hash
process_integrity_level process_path process_name process_arguments process_hash process_id
additional_logged_in_users_list module_name_list module_hash_list
src dest_hostname dest dest_port transport firstTime lastTime
| `cisco_nvm___rclone_execution_with_network_activity_filter`