sigma-rules/rules/windows/initial_access_scripts_process_started_via_wmi.toml

[metadata]
creation_date = "2020/11/27"
maturity = "production"
updated_date = "2020/12/17"

[rule]
author = ["Elastic"]
description = """
Identifies use of the built-in Windows script interpreters (cscript.exe or wscript.exe) being used to execute a process
via Windows Management Instrumentation (WMI). This may be indicative of malicious activity.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*"]
language = "eql"
license = "Elastic License"
name = "Windows Script Interpreter Executing Process via WMI"
risk_score = 47
rule_id = "b64b183e-1a76-422d-9179-7b389513e74d"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Execution"]
type = "eql"

query = '''
sequence by host.id with maxspan=5s
    [library where file.name : "wmiutils.dll" and process.name : ("wscript.exe", "cscript.exe")]
    [process where event.type in ("start", "process_started") and
     process.parent.name : "wmiprvse.exe" and
     user.domain != "NT AUTHORITY" and
     (process.pe.original_file_name in
                                (
                                  "cscript.exe",
                                  "wscript.exe",
                                  "PowerShell.EXE",
                                  "Cmd.Exe",
                                  "MSHTA.EXE",
                                  "RUNDLL32.EXE",
                                  "REGSVR32.EXE",
                                  "MSBuild.exe",
                                  "InstallUtil.exe",
                                  "RegAsm.exe",
                                  "RegSvcs.exe",
                                  "msxsl.exe",
                                  "CONTROL.EXE",
                                  "EXPLORER.EXE",
                                  "Microsoft.Workflow.Compiler.exe",
                                  "msiexec.exe"
                                  ) or
      process.executable : ("C:\\Users\\*.exe", "C:\\ProgramData\\*.exe")
     )
    ]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1566"
name = "Phishing"
reference = "https://attack.mitre.org/techniques/T1566/"
[[rule.threat.technique.subtechnique]]
id = "T1566.001"
name = "Spearphishing Attachment"
reference = "https://attack.mitre.org/techniques/T1566/001/"



[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"