many benign applications will create processes from executables in windows\temp, although unlikely to exceed the given threshold. filter as needed.

Techniques

T1059

Sample rules

Excessive distinct processes from Windows Temp

source: splunk
technicques:
- T1059

Description

This analytic will identify suspicious series of process executions. We have observed that post exploit framework tools like Koadic and Meterpreter will launch an excessive number of processes with distinct file paths from Windows\Temp to execute actions on objective. This behavior is extremely anomalous compared to typical application behaviors that use Windows\Temp.

Detection logic


| tstats `security_content_summariesonly` values(Processes.process) as process distinct_count(Processes.process) as distinct_process_count  min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where Processes.process_path = "*\\Windows\\Temp\\*" by Processes.dest Processes.user  _time span=20m 
| where distinct_process_count > 37 
| `drop_dm_object_name(Processes)` 
| `security_content_ctime(firstTime)` 
| `security_content_ctime(lastTime)` 
| `excessive_distinct_processes_from_windows_temp_filter`