defense_evasion_suspicious_managedcode_host_process.toml

[metadata]
creation_date = "2020/08/21"
maturity = "production"
updated_date = "2021/04/14"

[rule]
author = ["Elastic"]
description = """
Identifies a suspicious managed code hosting process which could indicate code injection or other form of suspicious
code execution.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Suspicious Managed Code Hosting Process"
references = ["https://blog.menasec.net/2019/07/interesting-difr-traces-of-net-clr.html"]
risk_score = 73
rule_id = "acf738b5-b5b2-4acc-bad9-1e18ee234f40"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
sequence by process.entity_id with maxspan=5m
 [process where event.type == "start" and 
  process.name : ("wscript.exe", "cscript.exe", "mshta.exe", "wmic.exe", "regsvr32.exe", "svchost.exe", "dllhost.exe", "cmstp.exe")]
 [file where event.type != "deletion" and
  file.name : ("wscript.exe.log",
               "cscript.exe",
               "mshta.exe.log",
               "wmic.exe.log",
               "svchost.exe.log",
               "dllhost.exe.log",
               "cmstp.exe.log",
               "regsvr32.exe.log")]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1055"
reference = "https://attack.mitre.org/techniques/T1055/"
name = "Process Injection"


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