splApache-2.0from splunk/security_content

Suspicious DLLHost no Command Line Arguments

The following analytic detects instances of DLLHost.exe executing without command line arguments. This behavior is unusual and often associated with malicious activities, such as those performed by Cobalt Strike. The detection leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs. This activity is significant because DLLHost.exe typically requires arguments to function correctly, and its absence may indicate an attempt to evade detection. If confirmed malicious, this could lead to unauthorized actions like credential dumping or file manipulation, posing a severe threat to the environment.

Quality

FP risk

—

Forks

Views

Rule sourcedetections/endpoint/suspicious_dllhost_no_command_line_arguments.yml

| tstats `security_content_summariesonly` count FROM datamodel=Endpoint.Processes where
(Processes.process_name=dllhost.exe OR Processes.original_file_name=dllhost.exe)
Processes.process IN ("*dllhost","*dllhost.exe", "*dllhost.exe\"")
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)`
| `suspicious_dllhost_no_command_line_arguments_filter`