Suspicious Execution via Windows Subsystem for Linux
editSuspicious Execution via Windows Subsystem for Linux
editDetects Linux Bash commands from the Windows Subsystem for Linux. Adversaries may enable and use WSL for Linux to avoid detection.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
- endgame-*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Execution
- Defense Evasion
- Elastic Endgame
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editprocess where event.type : "start" and ( ((process.executable : "?:\\Windows\\System32\\bash.exe" or process.pe.original_file_name == "Bash.exe") and not process.command_line : ("bash", "bash.exe")) or process.executable : "?:\\Users\\*\\AppData\\Local\\Packages\\*\\rootfs\\usr\\bin\\bash" or (process.parent.name : "wsl.exe" and process.parent.command_line : "bash*" and not process.name : "wslhost.exe") or (process.name : "wsl.exe" and process.args : ("curl", "/etc/shadow", "/etc/passwd", "cat","--system", "root", "-e", "--exec", "bash", "/mnt/c/*")) ) and not process.parent.executable : ("?:\\Program Files\\Docker\\*.exe", "?:\\Program Files (x86)\\Docker\\*.exe")
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Indirect Command Execution
- ID: T1202
- Reference URL: https://attack.mitre.org/techniques/T1202/
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
-
Sub-technique:
- Name: Unix Shell
- ID: T1059.004
- Reference URL: https://attack.mitre.org/techniques/T1059/004/