Windows Binaries Lolbins Renamed

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Id	cbf6ad48-fa5c-4bf7-b205-28dbadb91255
Rulename	Windows Binaries Lolbins Renamed
Description	This query detects the execution of renamed Windows binaries (Lolbins). This is a common technique used by adversaries to evade detection. Ref: https://docs.paloaltonetworks.com/cortex/cortex-xdr/cortex-xdr-analytics-alert-reference/cortex-xdr-analytics-alert-reference/execution-of-renamed-lolbin.html
Severity	Medium
Tactics	Execution
Techniques	T1059
Required data connectors	SecurityEvents WindowsSecurityEvents
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/Endpoint Threat Protection Essentials/Analytic Rules/WindowsBinariesLolbinsRenamed.yaml
Version	1.0.3
Arm template	cbf6ad48-fa5c-4bf7-b205-28dbadb91255.json

KQL

let procList = externaldata(Process:string) [@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Microsoft_Lolbas_Execution_Binaries.csv"] with (format="csv", ignoreFirstRecord=True);
Event
| where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID==1
| parse EventData with * 'Image">' Image "<" * 'OriginalFileName">' OriginalFileName "<" *
| where OriginalFileName has_any (procList) and not (Image has_any (procList))
| parse EventData with * 'ProcessGuid">' ProcessGuid "<" * 'Description">' Description "<" * 'CommandLine">' CommandLine "<" * 'CurrentDirectory">' CurrentDirectory "<" * 'User">' User "<" * 'LogonGuid">' LogonGuid "<" * 'Hashes">' Hashes "<" * 'ParentProcessGuid">' ParentProcessGuid "<" * 'ParentImage">' ParentImage "<" * 'ParentCommandLine">' ParentCommandLine "<" * 'ParentUser">' ParentUser "<" *
| summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, User, ParentImage, ParentProcessGuid, ParentCommandLine, ParentUser, Image, ProcessGuid, CommandLine, Description, OriginalFileName, CurrentDirectory, Hashes
| extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')

YAML

relevantTechniques:
- T1059
name: Windows Binaries Lolbins Renamed
triggerThreshold: 0
tactics:
- Execution
severity: Medium
id: cbf6ad48-fa5c-4bf7-b205-28dbadb91255
status: Available
requiredDataConnectors:
- dataTypes:
  - SecurityEvent
  connectorId: SecurityEvents
- dataTypes:
  - SecurityEvent
  connectorId: WindowsSecurityEvents
kind: Scheduled
query: |
  let procList = externaldata(Process:string) [@"https://raw.githubusercontent.com/Azure/Azure-Sentinel/master/Sample%20Data/Microsoft_Lolbas_Execution_Binaries.csv"] with (format="csv", ignoreFirstRecord=True);
  Event
  | where EventLog =~ "Microsoft-Windows-Sysmon/Operational" and EventID==1
  | parse EventData with * 'Image">' Image "<" * 'OriginalFileName">' OriginalFileName "<" *
  | where OriginalFileName has_any (procList) and not (Image has_any (procList))
  | parse EventData with * 'ProcessGuid">' ProcessGuid "<" * 'Description">' Description "<" * 'CommandLine">' CommandLine "<" * 'CurrentDirectory">' CurrentDirectory "<" * 'User">' User "<" * 'LogonGuid">' LogonGuid "<" * 'Hashes">' Hashes "<" * 'ParentProcessGuid">' ParentProcessGuid "<" * 'ParentImage">' ParentImage "<" * 'ParentCommandLine">' ParentCommandLine "<" * 'ParentUser">' ParentUser "<" *
  | summarize StartTime = min(TimeGenerated), EndTime = max(TimeGenerated) by EventID, Computer, User, ParentImage, ParentProcessGuid, ParentCommandLine, ParentUser, Image, ProcessGuid, CommandLine, Description, OriginalFileName, CurrentDirectory, Hashes
  | extend HostName = iif(Computer has '.',substring(Computer,0,indexof(Computer,'.')),Computer) , DnsDomain = iif(Computer has '.',substring(Computer,indexof(Computer,'.')+1),'')  
description: |
  'This query detects the execution of renamed Windows binaries (Lolbins). This is a common technique used by adversaries to evade detection. 
  Ref: https://docs.paloaltonetworks.com/cortex/cortex-xdr/cortex-xdr-analytics-alert-reference/cortex-xdr-analytics-alert-reference/execution-of-renamed-lolbin.html'  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/WindowsBinariesLolbinsRenamed.yaml
triggerOperator: gt
queryPeriod: 1h
queryFrequency: 1h
version: 1.0.3
entityMappings:
- entityType: Process
  fieldMappings:
  - columnName: CommandLine
    identifier: CommandLine
- entityType: Host
  fieldMappings:
  - columnName: Computer
    identifier: FullName
  - columnName: HostName
    identifier: HostName
  - columnName: DnsDomain
    identifier: DnsDomain
- entityType: Account
  fieldMappings:
  - columnName: User
    identifier: Name

ARM