sigma-rules/rules/cross-platform/persistence_shell_profile_modification.toml

[metadata]
creation_date = "2021/01/19"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/09/22"

[rule]
author = ["Elastic"]
description = """
Both ~/.bash_profile and ~/.bashrc are files containing shell commands that are run when Bash is invoked. These files
are executed in a user's context, either interactively or non-interactively, when a user logs in so that their
environment is set correctly. Adversaries may abuse this to establish persistence by executing malicious content
triggered by a user’s shell.
"""
false_positives = ["Changes to the Shell Profile tend to be noisy, a tuning per your environment will be required."]
from = "now-9m"
index = ["logs-endpoint.events.*", "auditbeat-*"]
language = "kuery"
license = "Elastic License v2"
name = "Bash Shell Profile Modification"
references = ["https://www.anomali.com/blog/pulling-linux-rabbit-rabbot-malware-out-of-a-hat"]
risk_score = 47
rule_id = "e6c1a552-7776-44ad-ae0f-8746cc07773c"
severity = "medium"
tags = ["Domain: Endpoint",
        "OS: macOS",
        "OS: Linux",
        "Use Case: Threat Detection",
        "Tactic: Persistence",
        "Data Source: Elastic Defend"
        ]
timestamp_override = "event.ingested"
type = "query"

query = '''
event.category:file and event.type:change and
  process.name:(* and not (sudo or vim or zsh or env or nano or bash or Terminal or xpcproxy or login or cat or cp or
  launchctl or java or dnf or tailwatchd or ldconfig or yum or semodule or cpanellogd or dockerd or authselect or chmod or
  dnf-automatic or git or dpkg or platform-python)) and
  not process.executable:(/Applications/* or /private/var/folders/* or /usr/local/* or /opt/saltstack/salt/bin/*) and
  file.path:(/private/etc/rc.local or
             /etc/rc.local or
             /home/*/.profile or
             /home/*/.profile1 or
             /home/*/.bash_profile or
             /home/*/.bash_profile1 or
             /home/*/.bashrc or
             /Users/*/.bash_profile or
             /Users/*/.zshenv)
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1546"
name = "Event Triggered Execution"
reference = "https://attack.mitre.org/techniques/T1546/"

[[rule.threat.technique.subtechnique]]
id = "T1546.004"
name = "Unix Shell Configuration Modification"
reference = "https://attack.mitre.org/techniques/T1546/004/"

[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"