false positives should be limited as the analytic is specific to screenconnect path traversal attempts. tune as needed, or restrict to specific hosts if false positives are encountered.

Techniques

T1190

Sample rules

ConnectWise ScreenConnect Path Traversal Windows SACL

source: splunk
technicques:
- T1190

Description

The following analytic detects attempts to exploit the ConnectWise ScreenConnect CVE-2024-1708 vulnerability using Windows SACL EventCode 4663. It identifies path traversal attacks by monitoring file system events related to the ScreenConnect service. This activity is significant as it allows unauthorized access to sensitive files and directories, potentially leading to data exfiltration or arbitrary code execution. If confirmed malicious, attackers could gain unauthorized access to critical data or execute harmful code, compromising the integrity and security of the affected system. Immediate remediation by updating to version 23.9.8 or above is recommended.

Detection logic

`wineventlog_security` EventCode=4663  ProcessName=*\\ScreenConnect.Service.exe file_path IN ("*\\ScreenConnect\\App_Extensions\\*") file_name IN ("*.aspx","*.ashx") 
| stats count min(_time) as firstTime max(_time) as lastTime by  ObjectName ObjectType ProcessName AccessMask process_id EventCode Computer Caller_User_Name 
| rename Computer as dest Caller_User_Name as user ProcessName as process_name 
|  `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `connectwise_screenconnect_path_traversal_windows_sacl_filter`