From 6298f7b00a112f0fad8083b6db13523b2122e51d Mon Sep 17 00:00:00 2001 From: Austin Songer Date: Mon, 4 Oct 2021 12:58:02 -0500 Subject: [PATCH] [New Rule] Volume Shadow Copy Deletion via PowerShell (#1358) * Create defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update rules/windows/defense_evasion_volume_shadow_copy_deletion_via_powershell.toml Co-authored-by: Ross Wolf <31489089+rw-access@users.noreply.github.com> * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update rules/windows/defense_evasion_volume_shadow_copy_deletion_via_powershell.toml Co-authored-by: Jonhnathan * Update rules/windows/defense_evasion_volume_shadow_copy_deletion_via_powershell.toml Co-authored-by: Jonhnathan * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Update defense_evasion_volume_shadow_copy_deletion_via_powershell.toml * Rename defense_evasion_volume_shadow_copy_deletion_via_powershell.toml to impact_volume_shadow_copy_deletion_via_powershell.toml * Update impact_volume_shadow_copy_deletion_via_powershell.toml * Add trailing / * Update rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml Co-authored-by: Justin Ibarra Co-authored-by: Ross Wolf <31489089+rw-access@users.noreply.github.com> Co-authored-by: Jonhnathan Co-authored-by: Justin Ibarra --- ...e_shadow_copy_deletion_via_powershell.toml | 51 +++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml diff --git a/rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml b/rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml new file mode 100644 index 000000000..0c0467aea --- /dev/null +++ b/rules/windows/impact_volume_shadow_copy_deletion_via_powershell.toml @@ -0,0 +1,51 @@ +[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" +