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Potential Reverse Shell via Java

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Potential Reverse Shell via Java

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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.

Rule type: eql

Rule indices:

logs-endpoint.events.*

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:

https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/Methodology%20and%20Resources/Reverse%20Shell%20Cheatsheet.md

Tags:

Domain: Endpoint
OS: Linux
Use Case: Threat Detection
Tactic: Execution
Data Source: Elastic Defend

Version: 6

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

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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.name in (
    "bash", "dash", "ash", "sh", "tcsh", "csh", "zsh", "ksh", "fish"
  ) and not process.args : (
    "-xe", "/tmp/jenkins*.sh", "*/var/lib/jenkins/workspace/*", "vmstat*", "asterisk*", "mpstat*", "/usr/bin/ps*", "umask", "*yum*", "uptime -s",
    "df -h . | awk '{print $2}'", "free | awk \"/Mem:/\" | awk '{print $2}'"
  )
  ] by process.parent.entity_id

Framework: MITRE ATT&CK^TM

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/
Tactic:
- Name: Command and Control
- ID: TA0011
- Reference URL: https://attack.mitre.org/tactics/TA0011/
Technique:
- Name: Application Layer Protocol
- ID: T1071
- Reference URL: https://attack.mitre.org/techniques/T1071/

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