defense_evasion_processes_with_trailing_spaces.toml

[metadata]
creation_date = "2023/08/24"
integration = ["endpoint", "auditd_manager"]
maturity = "production"
updated_date = "2024/05/21"

[rule]
author = ["Elastic"]
building_block_type = "default"
description = """
Identify instances where adversaries include trailing space characters to mimic regular files, disguising their activity
to evade default file handling mechanisms.
"""
from = "now-119m"
index = ["logs-endpoint.events.*", "endgame-*", "auditbeat-*", "logs-auditd_manager.auditd-*"]
interval = "60m"
language = "eql"
license = "Elastic License v2"
name = "Processes with Trailing Spaces"
risk_score = 21
rule_id = "0c093569-dff9-42b6-87b1-0242d9f7d9b4"
severity = "low"
tags = [
    "Domain: Endpoint",
    "OS: Linux",
    "OS: macOS",
    "Use Case: Threat Detection",
    "Tactic: Defense Evasion",
    "Rule Type: BBR",
    "Data Source: Elastic Defend",
    "Data Source: Elastic Endgame",
    "Data Source: Auditd Manager",
]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type == "start" and event.action in ("exec", "exec_event", "executed", "process_started") and
process.name : "* "
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1036"
name = "Masquerading"
reference = "https://attack.mitre.org/techniques/T1036/"
[[rule.threat.technique.subtechnique]]
id = "T1036.006"
name = "Space after Filename"
reference = "https://attack.mitre.org/techniques/T1036/006/"



[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"