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 = "2022/12/14"

[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 = ["Elastic", "Host", "macOS", "Linux", "Threat Detection", "Persistence"]
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)) and
  not process.executable:(/Applications/* or /private/var/folders/* or /usr/local/*) 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/"