Query: detect Detects command that type the content of ntdll.dll to a different file or a pipe in order to evade AV / EDR detection. A in logs
Matching passage: Sigma rule: Detects command that type the content of ntdll.dll to a different file or a pipe in order to evade AV / EDR detection. A. Logsource: windows / process_creation. Rule: title: NtdllPipe Like Activity Execution id: bbc865e4-7fcd-45a6-8ff1-95ced28ec5b2 status: test description: Detects command that type the content of ntdll.dll to a different file or a pipe in order to evade AV / EDR detection. As seen being used in the POC NtdllPipe references: - https://web.archive.org/web/20220306121156/https://www.x86matthew.com/view_post?id=ntdll_pipe author: Florian Roth (Nextron Systems) date: 2022-03-05 modified: 2023-03-07 tags: - attack.defense-impairment logsource: category: process_creation product: windows detection: selection: CommandLine|contains: - type %windir%\system32\ntdll.dll - type %systemroot%\system32\ntdll.dll - type c:\windows\system32\ntdll.dll - \\ntdll.dll > \\\\.\\pipe\\ condition: selection falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects attempts to add, modify, or delete Windows Credential Guard related registry keys or values via command line too. Logsource: windows / process_creation. Rule: title: Windows Credential Guard Registry Tampering Via CommandLine id: c17d47b7-dcd6-4109-87eb-d1817bd4cbc9 related: - id: 73921b9c-cafd-4446-b0c6-fdb0ace42bc0 type: similar - id: d645ef86-2396-48a1-a2b6-b629ca3f57ff type: similar status: experimental description: 'Detects attempts to add, modify, or delete Windows Credential Guard related registry keys or values via command line tools such as Reg.exe or PowerShell. Credential Guard uses virtualization-based security to isolate secrets so that only privileged system software can access them. Adversaries may disable Credential Guard to gain access to sensitive credentials stored in the system, such as NTLM hashes and Kerberos tickets, which can be used for lateral movement and privilege escalation. The rule matches suspicious command lines that target DeviceGuard or LSA registry paths and manipulate keys like EnableVirtualizationBasedSecurity, RequirePlatformSecurityFeatures, or LsaCfgFlags. Such activity may indicate an attempt to disable or tamper with Credential Guard, potentially exposing sensitive credentials for misuse. ' references: - https://woshub.com/disable-credential-guard-windows/ - https://learn.microsoft.com/en-us/windows/client-management/mdm/policy-csp-deviceguard author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-12-26 tags: - attack.defense-impairment - attack.t1685 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - \reg.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll - reg.exe selection_cli: CommandLine|contains: - 'add ' - 'New-ItemProperty ' - 'Set-ItemProperty ' - 'si ' - 'delete ' - 'del ' - 'Remove-ItemProperty ' - 'rp ' selection_key_base: CommandLine|contains: - \Control\DeviceGuard - \Control\LSA - Software\Policies\Microsoft\Windows\DeviceGuard selection_key_specific: CommandLine|contains: - EnableVirtualizationBasedSecurity - RequirePlatformSecurityFeatures - LsaCfgFlags condition: all of selection_* falsepositives: - Unlikely level: high regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_credential_guard_registry_tampering/info.yml