Potential Ransomware activity related to Cobalt Strike

id: 4bd9ce9d-8586-4beb-8fdb-bd018cacbe7d
name: Potential Ransomware activity related to Cobalt Strike
description: |
  This query searches for alerts related to suspected ransomware and Cobalt Strike activity, a tool used in numerous ransomware campaigns. It looks for alerts that indicate potential ransomware activity, such as attempts to clear security event logs, delete backup files, and execute Cobalt Strike malware.
severity: High
status: Available
requiredDataConnectors:
  - connectorId: MicrosoftThreatProtection
    dataTypes:
      - AlertInfo
      - AlertEvidence
      - DeviceLogonEvents
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - Execution
  - Persistence
  - DefenseEvasion
  - Impact
relevantTechniques:
  - T1059
  - T1078
  - T1070
  - T1490
query: |
  // Look for sc.exe disabling services
  AlertInfo 
  // Attempts to clear security event logs. 
  | where Title in("Event log was cleared", 
  // List alerts flagging attempts to delete backup files. 
  "File backups were deleted", 
  // Potential Cobalt Strike activity - Note that other threat activity can also 
  // trigger alerts for suspicious decoded content 
  "Suspicious decoded content", 
  // Cobalt Strike activity 
  "\'Atosev\' malware was detected", 
  "\'Ploty\' malware was detected", 
  "\'Bynoco\' malware was detected",
  "\'Cobaltstrike\' malware was detected",
  "Echo command over pipe on localhost",
  "Known attack framework activity was observed",
  "An active \'Cobaltstrike\' malware was detected",
  "Suspicious \'CobaltStrike\' behavior was prevented",
  "Suspicious process launch by Rundll32.exe") 
  | extend AlertTime = TimeGenerated | distinct AlertTime, AlertId, Title 
  | join AlertEvidence on $left.AlertId == $right.AlertId
  | summarize by DeviceId, AlertTime, Title, AlertId
  // Get device IDs
  | join DeviceLogonEvents on $left.DeviceId == $right.DeviceId 
  // Creating 10 day Window surrounding alert activity 
  | where TimeGenerated < AlertTime + 12h and TimeGenerated > AlertTime - 12h // Projecting specific columns 
  | project Title, DeviceName, DeviceId, TimeGenerated, LogonType, AccountDomain, AccountName, AccountSid, AlertTime, AlertId, RemoteIP, RemoteDeviceName
  | extend AccountFullName = tostring(strcat(AccountDomain, "\\", AccountName))
  | extend HostName = iff(DeviceName has '.', substring(DeviceName, 0, indexof(DeviceName, '.')), DeviceName)
  | extend DnsDomain = iff(DeviceName has '.', substring(DeviceName, indexof(DeviceName, '.') + 1), "")
entityMappings:  
  - entityType: Host
    fieldMappings:
      - identifier: FullName
        columnName: DeviceName
      - identifier: HostName
        columnName: HostName
      - identifier: DnsDomain
        columnName: DnsDomain
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: AccountFullName
      - identifier: Name
        columnName: AccountName
      - identifier: DnsDomain
        columnName: AccountDomain
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: RemoteIP
version: 1.0.1
kind: Scheduled