sigma-rules/rules/windows/persistence_runtime_run_key_startup_susp_procs.toml

[metadata]
creation_date = "2020/11/19"
maturity = "production"
updated_date = "2021/03/03"

[rule]
author = ["Elastic"]
description = """
Identifies execution of suspicious persistent programs (scripts, rundll32, etc.) by looking at process lineage and
command line usage.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Execution of Persistent Suspicious Program"
risk_score = 47
rule_id = "e7125cea-9fe1-42a5-9a05-b0792cf86f5a"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Persistence"]
type = "eql"

query = '''
/* userinit followed by explorer followed by early child process of explorer (unlikely to be launched interactively) within 1m */
sequence by host.id, user.name with maxspan=1m
  [process where event.type in ("start", "process_started") and process.name : "userinit.exe" and process.parent.name : "winlogon.exe"]
  [process where event.type in ("start", "process_started") and process.name : "explorer.exe"]
  [process where event.type in ("start", "process_started") and process.parent.name : "explorer.exe" and
   /* add suspicious programs here */
   process.pe.original_file_name in ("cscript.exe",
                                     "wscript.exe",
                                     "PowerShell.EXE",
                                     "MSHTA.EXE",
                                     "RUNDLL32.EXE",
                                     "REGSVR32.EXE",
                                     "RegAsm.exe",
                                     "MSBuild.exe",
                                     "InstallUtil.exe") and
    /* add potential suspicious paths here */
    process.args : ("C:\\Users\\*", "C:\\ProgramData\\*", "C:\\Windows\\Temp\\*", "C:\\Windows\\Tasks\\*", "C:\\PerfLogs\\*", "C:\\Intel\\*")
   ]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1547"
name = "Boot or Logon Autostart Execution"
reference = "https://attack.mitre.org/techniques/T1547/"
[[rule.threat.technique.subtechnique]]
id = "T1547.001"
name = "Registry Run Keys / Startup Folder"
reference = "https://attack.mitre.org/techniques/T1547/001/"



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