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Suspicious Execution via Windows Subsystem for Linuxedit
Detects 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 queryedit
process 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/