sigma-rules/rules/linux/execution_shell_via_java_revshell_linux.toml

[metadata]
creation_date = "2023/07/04"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/07/25"

[rule]
author = ["Elastic"]
description = """
This detection rule identifies the execution of a Linux shell process from a Java JAR application post an incoming
network connection. This behavior may indicate reverse shell activity via a Java application.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Potential Reverse Shell via Java"
references = [
    "https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md"
]
risk_score = 47
rule_id = "5a3d5447-31c9-409a-aed1-72f9921594fd"
severity = "medium"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Execution", "Data Source: Elastic Defend"]
type = "eql"
query = '''
sequence by host.id with maxspan=5s
[ network where host.os.type == "linux" and event.action in ("connection_accepted", "connection_attempted") and 
  process.executable : ("/usr/bin/java", "/bin/java", "/usr/lib/jvm/*", "/usr/java/*") and
  destination.ip != null and destination.ip != "127.0.0.1" and destination.ip != "::1" ] by process.entity_id
[ process where host.os.type == "linux" and event.action == "exec" and 
  process.parent.executable : ("/usr/bin/java", "/bin/java", "/usr/lib/jvm/*", "/usr/java/*") and
  process.parent.args : "-jar"  and process.executable : "*sh" ] by process.parent.entity_id
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[rule.threat.tactic]
name = "Execution"
id = "TA0002"
reference = "https://attack.mitre.org/tactics/TA0002/"

[[rule.threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"

[[rule.threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"

[[rule.threat]]
framework = "MITRE ATT&CK"

[rule.threat.tactic]
name = "Command and Control"
id = "TA0011"
reference = "https://attack.mitre.org/tactics/TA0011/"

[[rule.threat.technique]]
name = "Application Layer Protocol"
id = "T1071"
reference = "https://attack.mitre.org/techniques/T1071/"