Stopping multiple processes using taskkill

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Id	4dd31bd5-11a3-4b9c-a7c5-4927ab4f2a77
Rulename	Stopping multiple processes using taskkill
Description	This query checks for attempts to stop at least 10 separate processes using the taskkill.exe utility. This is a common technique used by ransomware to stop security products and other processes.
Severity	Medium
Tactics	DefenseEvasion
Techniques	T1562
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/MultiProcessKillWithTaskKill.yaml
Version	1.0.0
Arm template	4dd31bd5-11a3-4b9c-a7c5-4927ab4f2a77.json

KQL

// Find attempts to stop processes using taskkill.exe
DeviceProcessEvents
| where FileName =~ "taskkill.exe" 
| summarize taskKillCount = dcount(ProcessCommandLine), TaskKillList = make_set(ProcessCommandLine, 10000) by DeviceId, DeviceName, bin(TimeGenerated, 2m)
| where taskKillCount > 10
| extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
| extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")

YAML

kind: Scheduled
requiredDataConnectors:
- dataTypes:
  - DeviceProcessEvents
  connectorId: MicrosoftThreatProtection
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: DeviceName
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
relevantTechniques:
- T1562
status: Available
tactics:
- DefenseEvasion
name: Stopping multiple processes using taskkill
queryFrequency: 1h
query: |
  // Find attempts to stop processes using taskkill.exe
  DeviceProcessEvents
  | where FileName =~ "taskkill.exe" 
  | summarize taskKillCount = dcount(ProcessCommandLine), TaskKillList = make_set(ProcessCommandLine, 10000) by DeviceId, DeviceName, bin(TimeGenerated, 2m)
  | where taskKillCount > 10
  | extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
  | extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")  
id: 4dd31bd5-11a3-4b9c-a7c5-4927ab4f2a77
severity: Medium
queryPeriod: 1h
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/Ransomware/MultiProcessKillWithTaskKill.yaml
version: 1.0.0
description: |
    This query checks for attempts to stop at least 10 separate processes using the taskkill.exe utility. This is a common technique used by ransomware to stop security products and other processes.
triggerThreshold: 0
triggerOperator: gt

ARM