Query: Sigma rule for Attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow.
Matching passage: Sigma rule: Attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow.. Logsource: windows / ps_classic_provider_start. Rule: title: Tamper Windows Defender - PSClassic id: ec19ebab-72dc-40e1-9728-4c0b805d722c related: - id: 14c71865-6cd3-44ae-adaa-1db923fae5f2 type: similar status: test description: Attempting to disable scheduled scanning and other parts of Windows Defender ATP or set default actions to allow. references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.001/T1562.001.md author: frack113, Nasreddine Bencherchali (Nextron Systems) date: 2021-06-07 modified: 2024-01-02 tags: - attack.defense-impairment - attack.t1685 logsource: product: windows category: ps_classic_provider_start detection: selection_set_mppreference: Data|contains: Set-MpPreference selection_options_bool_allow: Data|contains: - -dbaf $true - -dbaf 1 - -dbm $true - -dbm 1 - -dips $true - -dips 1 - -DisableArchiveScanning $true - -DisableArchiveScanning 1 - -DisableBehaviorMonitoring $true - -DisableBehaviorMonitoring 1 - -DisableBlockAtFirstSeen $true - -DisableBlockAtFirstSeen 1 - -DisableCatchupFullScan $true - -DisableCatchupFullScan 1 - -DisableCatchupQuickScan $true - -DisableCatchupQuickScan 1 - -DisableIntrusionPreventionSystem $true - -DisableIntrusionPreventionSystem 1 - -DisableIOAVProtection $true - -DisableIOAVProtection 1 - -DisableRealtimeMonitoring $true - -DisableRealtimeMonitoring 1 - -DisableRemovableDriveScanning $true - -DisableRemovableDriveScanning 1 - -DisableScanningMappedNetworkDrivesForFullScan $true - -DisableScanningMappedNetworkDrivesForFullScan 1 - -DisableScanningNetworkFiles $true - -DisableScanningNetworkFiles 1 - -DisableScriptScanning $true - -DisableScriptScanning 1 - -MAPSReporting $false - -MAPSReporting 0 - -drdsc $true - -drdsc 1 - -drtm $true - -drtm 1 - -dscrptsc $true - -dscrptsc 1 - -dsmndf $true - -dsmndf 1 - -dsnf $true - -dsnf 1 - -dss $true - -dss 1 selection_options_actions_func: Data|contains: - HighThreatDefaultAction Allow - htdefac Allow - LowThreatDefaultAction Allow - ltdefac Allow - ModerateThreatDefaultAction Allow - mtdefac Allow - SevereThreatDefaultAction Allow - stdefac Allow condition: selection_set_mppreference and 1 of selection_options_* falsepositives: - Legitimate PowerShell scripts that disable Windows Defender for troubleshooting purposes. Must be investigated. level: high
Near-miss passage: Sigma rule: Detects suspicious powershell execution via a schedule task where the command ends with an suspicious flags to hide the. Logsource: windows / process_creation. Rule: title: Potential Persistence Via Powershell Search Order Hijacking - Task id: b66474aa-bd92-4333-a16c-298155b120df related: - id: 6e8811ee-90ba-441e-8486-5653e68b2299 type: similar status: test description: Detects suspicious powershell execution via a schedule task where the command ends with an suspicious flags to hide the powershell instance instead of executeing scripts or commands. This could be a sign of persistence via PowerShell "Get-Variable" technique as seen being used in Colibri Loader references: - https://blog.malwarebytes.com/threat-intelligence/2022/04/colibri-loader-combines-task-scheduler-and-powershell-in-clever-persistence-technique/ author: pH-T (Nextron Systems), Florian Roth (Nextron Systems) date: 2022-04-08 modified: 2023-02-03 tags: - attack.privilege-escalation - attack.execution - attack.persistence - attack.t1053.005 - attack.t1059.001 logsource: product: windows category: process_creation detection: selection: ParentImage: C:\WINDOWS\System32\svchost.exe ParentCommandLine|contains|all: - -k netsvcs - -s Schedule CommandLine|endswith: - ' -windowstyle hidden' - ' -w hidden' - ' -ep bypass' - ' -noni' condition: selection falsepositives: - Unknown level: high