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Potential Reverse Shell via Suspicious Parent Process
editPotential Reverse Shell via Suspicious Parent Process
editThis detection rule detects the creation of a shell through a suspicious parent child relationship. Any reverse shells spawned by the specified utilities that use a forked process to initialize the connection attempt will be captured through this rule. Attackers may spawn reverse shells to establish persistence onto a target system.
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:
Tags:
- Domain: Endpoint
- OS: Linux
- Use Case: Threat Detection
- Tactic: Execution
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by host.id, process.parent.entity_id with maxspan=1s [ process where host.os.type == "linux" and event.type == "start" and event.action == "fork" and ( (process.name : "python*" and process.args : "-c") or (process.name : "php*" and process.args : "-r") or (process.name : "perl" and process.args : "-e") or (process.name : "ruby" and process.args : ("-e", "-rsocket")) or (process.name : "lua*" and process.args : "-e") or (process.name : "openssl" and process.args : "-connect") or (process.name : ("nc", "ncat", "netcat") and process.args_count >= 3) or (process.name : "telnet" and process.args_count >= 3) or (process.name : "awk")) and process.parent.name : ("python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk") ] [ network where host.os.type == "linux" and event.type == "start" and event.action == "connection_attempted" and process.name : ("python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk") ]
Framework: MITRE ATT&CKTM
-
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/