Mika Ayenson
a52751494e
* Convert config header to setup in note field * Parse note field into separate setup and note field with marko gfm * only validate and parse note on elastic authored rules and add CLI description for new DR_BYPASS_NOTE_VALIDATION_AND_PARSE environment variable Co-authored-by: brokensound77 <brokensound77@users.noreply.github.com>
54 lines
1.8 KiB
TOML
54 lines
1.8 KiB
TOML
[metadata]
|
|
creation_date = "2020/10/19"
|
|
maturity = "production"
|
|
updated_date = "2022/03/31"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = "Identifies command shell activity started via RunDLL32, which is commonly abused by attackers to host malicious code."
|
|
false_positives = ["Microsoft Windows installers leveraging RunDLL32 for installation."]
|
|
from = "now-9m"
|
|
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Command Shell Activity Started via RunDLL32"
|
|
note = """## Setup
|
|
|
|
If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define `event.ingested` and default fallback for EQL rules was not added until 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.
|
|
"""
|
|
risk_score = 21
|
|
rule_id = "9ccf3ce0-0057-440a-91f5-870c6ad39093"
|
|
severity = "low"
|
|
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
process where event.type == "start" and
|
|
process.name : ("cmd.exe", "powershell.exe") and
|
|
process.parent.name : "rundll32.exe" and process.parent.command_line != null and
|
|
/* common FPs can be added here */
|
|
not process.parent.args : ("C:\\Windows\\System32\\SHELL32.dll,RunAsNewUser_RunDLL",
|
|
"C:\\WINDOWS\\*.tmp,zzzzInvokeManagedCustomActionOutOfProc")
|
|
'''
|
|
|
|
|
|
[[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.technique.subtechnique]]
|
|
id = "T1059.001"
|
|
name = "PowerShell"
|
|
reference = "https://attack.mitre.org/techniques/T1059/001/"
|
|
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0002"
|
|
name = "Execution"
|
|
reference = "https://attack.mitre.org/tactics/TA0002/"
|
|
|