sigma-rules/rules/linux/execution_perl_tty_shell.toml

[metadata]
creation_date = "2020/04/16"
maturity = "production"
updated_date = "2020/11/03"

[rule]
author = ["Elastic"]
description = """
Identifies when a terminal (tty) is spawned via Perl. Attackers may upgrade a simple reverse shell to a fully
interactive tty after obtaining initial access to a host.
"""
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "kuery"
license = "Elastic License"
name = "Interactive Terminal Spawned via Perl"
risk_score = 73
rule_id = "05e5a668-7b51-4a67-93ab-e9af405c9ef3"
severity = "high"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Execution"]
type = "query"

query = '''
event.category:process and event.type:(start or process_started) and process.name:perl and
  process.args:("exec \"/bin/sh\";" or "exec \"/bin/dash\";" or "exec \"/bin/bash\";")
'''


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


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