LoFP / administrators can leverage psexec for accessing remote systems and might pass `accepteula` as an argument if they are running this tool for the first time. however, it is not likely that you'd see multiple occurrences of this event on a machine

Techniques

• T1021.002

Sample rules

Detect PsExec With accepteula Flag

• source: splunk
• technicques:
  • T1021.002

Description

The following analytic identifies the execution of PsExec.exe with the accepteula flag in the command line. It leverages data from Endpoint Detection and Response (EDR) agents, focusing on process execution logs and command-line arguments. This activity is significant because PsExec is commonly used by threat actors to execute code on remote systems, and the accepteula flag indicates first-time usage, which could signify initial compromise. If confirmed malicious, this activity could allow attackers to gain remote code execution capabilities, potentially leading to further system compromise and lateral movement within the network.

Detection logic

| tstats `security_content_summariesonly` values(Processes.process) as process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where `process_psexec` Processes.process=*accepteula* by Processes.dest Processes.user Processes.parent_process_name Processes.process_name Processes.process Processes.process_id Processes.parent_process_id 
| `drop_dm_object_name(Processes)`
| `security_content_ctime(firstTime)`
| `security_content_ctime(lastTime)` 
| `detect_psexec_with_accepteula_flag_filter`