Detection rules › Sigma
PSexec application execution
Detects scenarios where an attacker installs and executes PSexec.
Known false positives
- Administrator activity
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 1: Process creation |
Rule body
title: PSexec application execution
description: Detects scenarios where an attacker installs and executes PSexec.
references:
- https://github.com/mdecrevoisier/EVTX-to-MITRE-Attack/tree/master/TA0008-Lateral%20Movement/T1021.002%20-SMB%20Windows%20Admin%20Shares
- https://attack.mitre.org/software/S0029/
- https://pentera.io/blog/135-is-the-new-145/
- https://nv2lt.github.io/windows/smb-psexec-smbexec-winexe-how-to/
- https://www.synacktiv.com/publications/traces-of-windows-remote-command-execution.html
tags:
- attack.execution
- attack.t1569.002
author: mdecrevoisier
status: experimental
logsource:
product: windows
category: process_creation
detection:
selection_process_child:
NewProcessName|endswith: \PSEXESVC.exe
selection_process_parent:
ParentProcessName|endswith: \PSEXESVC.exe
Version: 2 # parent process name is available starting Windows 10 / Server 2016 and higher
condition: selection_process_child or selection_process_parent
falsepositives:
- Administrator activity
level: medium
Stages and Predicates
Stage 0: condition
selection_process_child or selection_process_parentStage 1: selection_process_child
selection_process_child:
NewProcessName|endswith: \PSEXESVC.exe
Stage 2: selection_process_parent
selection_process_parent:
ParentProcessName|endswith: \PSEXESVC.exe
Version: 2
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
NewProcessName | ends_with |
| field:"Image" kind:ends_with value:"\PSEXESVC.exe" |
ParentProcessName | ends_with |
| field:"parent_process_name" kind:ends_with value:"\PSEXESVC.exe" |
Version | eq |
| field:"Version" kind:eq value:"2" |