IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Potential Reverse Shell via Suspicious Child Process
editPotential Reverse Shell via Suspicious Child Process
editThis detection rule detects the creation of a shell through a suspicious process chain. Any reverse shells spawned by the specified utilities that are initialized from a single process followed by a network 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
- Data Source: Elastic Defend
Version: 4
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by host.id, process.entity_id with maxspan=1s [ process where host.os.type == "linux" and event.type == "start" and event.action == "exec" 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 : ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish") ] [ network where host.os.type == "linux" and event.type == "start" and event.action in ("connection_attempted", "connection_accepted") and process.name : ("python*", "php*", "perl", "ruby", "lua*", "openssl", "nc", "netcat", "ncat", "telnet", "awk") and destination.ip != null and destination.ip != "127.0.0.1" and destination.ip != "::1" ]
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/