This search looks for the creation of local administrator accounts using net.exe.

ATT&CK Detection

Technique Subtechnique(s) Tactic(s) Level of Coverage
Create Account Local Account Persistence Moderate

Data Model References

Object Action Field
process create exe
process create command_line

Applicable Sensors

Implementations

Pseudocode – CertUtil certificate extraction (Pseudocode, CAR native)

Pseudocode implementation of the Splunk search below

processes = search Process:Create
certutil_downloads = filter processes where (
  (exe = C:\Windows\System32\net.exe OR exe = C:\Windows\System32\net1.exe ) AND command_line = * -exportPFX * )
output certutil_downloads

Splunk code (Splunk, Endpoint)

You must be ingesting data that records process activity from your hosts to populate the Endpoint data model in the Processes node. You must also be ingesting logs with both the process name and command line from your endpoints. The command-line arguments are mapped to the “process” field in the Endpoint data model.

| tstats count values(Processes.user) as user values(Processes.parent_process) as parent_process min(_time) as firstTime max(_time) as lastTime from datamodel=Endpoint.Processes where (Processes.process_name=net.exe OR Processes.process_name=net1.exe) AND (Processes.process=*localgroup* OR Processes.process=*/add* OR Processes.process=*user*) by Processes.process Processes.process_name Processes.dest   |`create_local_admin_accounts_using_net_exe_filter`

Unit Tests

Test Case 1

Configurations: Using Splunk Attack Range

Replay the detection dataset using the Splunk attack range with the commands below

python attack_range.py replay -dn data_dump [--dump NAME_OF_DUMP]

Test Case 2

Configurations: Using Invoke-AtomicRedTeam

execute the atomic test T1136.001 against a Windows target.

Invoke-AtomicTest T1136.001