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 Activity via Terminal
editPotential Reverse Shell Activity via Terminal
editIdentifies the execution of a shell process with suspicious arguments which may be indicative of reverse shell activity.
Rule type: eql
Rule indices:
- auditbeat-*
- logs-endpoint.events.*
Severity: high
Risk score: 73
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
- Linux
- macOS
- Threat Detection
- Execution
Version: 5
Rule authors:
- Elastic
Rule license: Elastic License v2
Investigation guide
edit## Setup If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
Rule query
editprocess where event.type in ("start", "process_started") and process.name in ("sh", "bash", "zsh", "dash", "zmodload") and process.args : ("*/dev/tcp/*", "*/dev/udp/*", "*zsh/net/tcp*", "*zsh/net/udp*") and /* noisy FPs */ not (process.parent.name : "timeout" and process.executable : "/var/lib/docker/overlay*") and not process.command_line : ("*/dev/tcp/sirh_db/*", "*/dev/tcp/remoteiot.com/*", "*dev/tcp/elk.stag.one/*", "*dev/tcp/kafka/*", "*/dev/tcp/$0/$1*", "*/dev/tcp/127.*", "*/dev/udp/127.*", "*/dev/tcp/localhost/*") and not process.parent.command_line : "runc init"
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/