sigma-rules/rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml

[metadata]
creation_date = "2021/07/19"
maturity = "production"
updated_date = "2021/10/01"

[rule]
author = ["Elastic", "Austin Songer"]
description = """
Identifies the use of the Win32_ShadowCopy class and related cmdlets to achieve shadow copy deletion. This commonly occurs
in tandem with ransomware or other destructive attacks.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "Volume Shadow Copy Deletion via PowerShell"
references = [
    "https://docs.microsoft.com/en-us/previous-versions/windows/desktop/vsswmi/win32-shadowcopy",
    "https://powershell.one/wmi/root/cimv2/win32_shadowcopy",
    "https://www.fortinet.com/blog/threat-research/stomping-shadow-copies-a-second-look-into-deletion-methods",
]
risk_score = 73
rule_id = "d99a037b-c8e2-47a5-97b9-170d076827c4"
severity = "high"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Impact"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type in ("start", "process_started") and
  process.name : ("powershell.exe", "pwsh.exe") and 
  process.args : ("*Get-WmiObject*", "*gwmi*", "*Get-CimInstance*", "*gcim*") and
  process.args : ("*Win32_ShadowCopy*") and
  process.args : ("*.Delete()*", "*Remove-WmiObject*", "*rwmi*", "*Remove-CimInstance*", "*rcim*")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1490"
reference = "https://attack.mitre.org/techniques/T1490/"
name = "Inhibit System Recovery"



[rule.threat.tactic]
id = "TA0040"
reference = "https://attack.mitre.org/tactics/TA0040/"
name = "Impact"