defense_evasion_dotnet_compiler_parent_process.toml

[metadata]
creation_date = "2020/08/21"
maturity = "production"
updated_date = "2021/09/23"

[rule]
author = ["Elastic"]
description = "Identifies suspicious .NET code execution. connections."
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Suspicious .NET Code Compilation"
risk_score = 47
rule_id = "201200f1-a99b-43fb-88ed-f65a45c4972c"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type in ("start", "process_started") and
  process.name : ("csc.exe", "vbc.exe") and
  process.parent.name : ("wscript.exe", "mshta.exe", "cscript.exe", "wmic.exe", "svchost.exe", "rundll32.exe", "cmstp.exe", "regsvr32.exe")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1027"
name = "Obfuscated Files or Information"
reference = "https://attack.mitre.org/techniques/T1027/"

  [[rule.threat.technique.subtechnique]]
  id = "T1027.004"
  name = "Compile After Delivery"
  reference = "https://attack.mitre.org/techniques/T1027/004/"


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