AV detections related to Tarrask malware

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Id	1785d372-b9fe-4283-96a6-3a1d83cabfd1
Rulename	AV detections related to Tarrask malware
Description	This query looks for Microsoft Defender AV detections related to Tarrask malware. In Microsoft Sentinel, the SecurityAlerts table includes only the Device Name of the affected device, this query joins the DeviceInfo table to clearly connect other information such as Device group, ip, logged-on users etc. This would allow the Microsoft Sentinel analyst to have more context related to the alert, if available. Reference: https://www.microsoft.com/security/blog/2022/04/12/tarrask-malware-uses-scheduled-tasks-for-defense-evasion/
Severity	High
Tactics	Persistence
Techniques	T1053
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/AVTarrask.yaml
Version	1.0.4
Arm template	1785d372-b9fe-4283-96a6-3a1d83cabfd1.json

KQL

let Tarrask_threats = dynamic(["HackTool:Win64/Tarrask!MS", "HackTool:Win64/Ligolo!MSR", "Behavior:Win32/ScheduledTaskHide.A", "Tarrask"]);
DeviceInfo
| extend DeviceName = tolower(DeviceName)
| join kind=rightouter ( SecurityAlert
| where ProviderName =~ "MDATP"
| extend ThreatName = tostring(parse_json(ExtendedProperties).ThreatName)
| extend ThreatFamilyName = tostring(parse_json(ExtendedProperties).ThreatFamilyName)
| where ThreatName in~ (Tarrask_threats) or ThreatFamilyName in~ (Tarrask_threats)
| extend CompromisedEntity = tolower(CompromisedEntity)
) on $left.DeviceName == $right.CompromisedEntity
| summarize by DisplayName, ThreatName, ThreatFamilyName, PublicIP, AlertSeverity, Description, tostring(LoggedOnUsers), DeviceId, TenantId , bin(TimeGenerated, 1d), CompromisedEntity, tostring(LoggedOnUsers), ProductName, Entities
| extend HostName = tostring(split(CompromisedEntity, ".")[0]), DomainIndex = toint(indexof(CompromisedEntity, '.'))
| extend HostNameDomain = iff(DomainIndex != -1, substring(CompromisedEntity, DomainIndex + 1), CompromisedEntity)

YAML

relevantTechniques:
- T1053
entityMappings:
- fieldMappings:
  - columnName: CompromisedEntity
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: HostNameDomain
    identifier: DnsDomain
  entityType: Host
- fieldMappings:
  - columnName: PublicIP
    identifier: Address
  entityType: IP
triggerThreshold: 0
description: |
  'This query looks for Microsoft Defender AV detections related to Tarrask malware. In Microsoft Sentinel, the SecurityAlerts table includes only the Device Name of the affected device, this query joins the DeviceInfo table to clearly connect other information such as Device group, ip, logged-on users etc. 
   This would allow the Microsoft Sentinel analyst to have more context related to the alert, if available.
   Reference: https://www.microsoft.com/security/blog/2022/04/12/tarrask-malware-uses-scheduled-tasks-for-defense-evasion/'  
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - SecurityAlert
triggerOperator: gt
version: 1.0.4
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft Defender XDR/Analytic Rules/AVTarrask.yaml
id: 1785d372-b9fe-4283-96a6-3a1d83cabfd1
queryFrequency: 1d
query: |
  let Tarrask_threats = dynamic(["HackTool:Win64/Tarrask!MS", "HackTool:Win64/Ligolo!MSR", "Behavior:Win32/ScheduledTaskHide.A", "Tarrask"]);
  DeviceInfo
  | extend DeviceName = tolower(DeviceName)
  | join kind=rightouter ( SecurityAlert
  | where ProviderName =~ "MDATP"
  | extend ThreatName = tostring(parse_json(ExtendedProperties).ThreatName)
  | extend ThreatFamilyName = tostring(parse_json(ExtendedProperties).ThreatFamilyName)
  | where ThreatName in~ (Tarrask_threats) or ThreatFamilyName in~ (Tarrask_threats)
  | extend CompromisedEntity = tolower(CompromisedEntity)
  ) on $left.DeviceName == $right.CompromisedEntity
  | summarize by DisplayName, ThreatName, ThreatFamilyName, PublicIP, AlertSeverity, Description, tostring(LoggedOnUsers), DeviceId, TenantId , bin(TimeGenerated, 1d), CompromisedEntity, tostring(LoggedOnUsers), ProductName, Entities
  | extend HostName = tostring(split(CompromisedEntity, ".")[0]), DomainIndex = toint(indexof(CompromisedEntity, '.'))
  | extend HostNameDomain = iff(DomainIndex != -1, substring(CompromisedEntity, DomainIndex + 1), CompromisedEntity)  
severity: High
status: Available
queryPeriod: 1d
name: AV detections related to Tarrask malware
tactics:
- Persistence
kind: Scheduled

ARM