Process Creation with Suspicious CommandLine Arguments

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Id	fdbcc0eb-44fb-467e-a51d-a91df0780a81
Rulename	Process Creation with Suspicious CommandLine Arguments
Description	This analytic rule detects process creation events with base64 encoded command line arguments. This could be an indication of a malicious process being executed.
Severity	Medium
Tactics	Execution DefenseEvasion
Techniques	T1059 T1027
Required data connectors	CiscoSecureEndpoint CrowdStrikeFalconEndpointProtection MicrosoftThreatProtection SentinelOne TrendMicroApexOne TrendMicroApexOneAma VMwareCarbonBlack
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/Malware Protection Essentials/Analytic Rules/SuspiciousProcessCreation.yaml
Version	1.0.1
Arm template	fdbcc0eb-44fb-467e-a51d-a91df0780a81.json

KQL

_ASim_ProcessEvent
| where EventType == 'ProcessCreated'
| extend CommandLineArgs = strcat_array(array_slice(split(CommandLine, " "), 1, -1), " ")
| where strlen(CommandLineArgs) > 0
| where CommandLineArgs contains "base64"
| project
TimeGenerated,
DvcHostname,
DvcIpAddr,
DvcDomain,
TargetUsername,
TargetUsernameType,
TargetProcessName,
TargetProcessId,
CommandLine
| extend Username = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[1]), TargetUsername)
| extend NTDomain = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[0]), TargetUsername)
| extend Username = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[0]), Username)
| extend UPNSuffix = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[1]), '')

YAML

name: Process Creation with Suspicious CommandLine Arguments
triggerOperator: gt
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CrowdStrikeFalconEndpointProtection
- dataTypes:
  - SecurityAlert
  connectorId: MicrosoftThreatProtection
- dataTypes:
  - SentinelOne_CL
  connectorId: SentinelOne
- dataTypes:
  - CarbonBlackEvents_CL
  connectorId: VMwareCarbonBlack
- dataTypes:
  - CiscoSecureEndpoint_CL
  connectorId: CiscoSecureEndpoint
- dataTypes:
  - TMApexOneEvent
  connectorId: TrendMicroApexOne
- dataTypes:
  - TMApexOneEvent
  connectorId: TrendMicroApexOneAma
tags:
- Schema: _ASim_ProcessEvent
  SchemaVersion: 0.1.4
description: |
    This analytic rule detects process creation events with base64 encoded command line arguments. This could be an indication of a malicious process being executed.
queryPeriod: 1h
severity: Medium
alertDetailsOverride:
  alertDisplayNameFormat: Process with suspicious command line arguments was created on {{DvcHostname}} ({{DvcIpAddr}}) by ({{TargetUsername}})
  alertDescriptionFormat: "Process '{{TargetProcessName}}' ProcessId: '{{TargetProcessId}}' with commandline {{CommandLine}} was created."
id: fdbcc0eb-44fb-467e-a51d-a91df0780a81
kind: Scheduled
status: Available
eventGroupingSettings:
  aggregationKind: AlertPerResult
triggerThreshold: 0
query: |
  _ASim_ProcessEvent
  | where EventType == 'ProcessCreated'
  | extend CommandLineArgs = strcat_array(array_slice(split(CommandLine, " "), 1, -1), " ")
  | where strlen(CommandLineArgs) > 0
  | where CommandLineArgs contains "base64"
  | project
  TimeGenerated,
  DvcHostname,
  DvcIpAddr,
  DvcDomain,
  TargetUsername,
  TargetUsernameType,
  TargetProcessName,
  TargetProcessId,
  CommandLine
  | extend Username = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[1]), TargetUsername)
  | extend NTDomain = iff(tostring(TargetUsernameType) == 'Windows', tostring(split(TargetUsername, '\\')[0]), TargetUsername)
  | extend Username = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[0]), Username)
  | extend UPNSuffix = iff(tostring(TargetUsernameType) == 'UPN', tostring(split(TargetUsername, '@')[1]), '')  
version: 1.0.1
relevantTechniques:
- T1059
- T1027
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Malware Protection Essentials/Analytic Rules/SuspiciousProcessCreation.yaml
queryFrequency: 1h
entityMappings:
- fieldMappings:
  - identifier: HostName
    columnName: DvcHostname
  - identifier: DnsDomain
    columnName: DvcDomain
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Host
- fieldMappings:
  - identifier: Address
    columnName: DvcIpAddr
  entityType: IP
- fieldMappings:
  - identifier: Name
    columnName: Username
  - identifier: UPNSuffix
    columnName: UPNSuffix
  - identifier: NTDomain
    columnName: NTDomain
  entityType: Account
- fieldMappings:
  - identifier: ProcessId
    columnName: TargetProcessId
  - identifier: CommandLine
    columnName: CommandLine
  entityType: Process
tactics:
- Execution
- DefenseEvasion

ARM