Query: detection rule: Detects a "winlogon.exe" process that initiate network communications with public IP addresses
Matching passage: Sigma rule: Detects a "winlogon.exe" process that initiate network communications with public IP addresses. Logsource: windows / network_connection. Rule: title: Outbound Network Connection To Public IP Via Winlogon id: 7610a4ea-c06d-495f-a2ac-0a696abcfd3b status: test description: Detects a "winlogon.exe" process that initiate network communications with public IP addresses references: - https://www.microsoft.com/en-us/security/blog/2023/04/11/guidance-for-investigating-attacks-using-cve-2022-21894-the-blacklotus-campaign/ author: Christopher Peacock @securepeacock, SCYTHE @scythe_io date: 2023-04-28 modified: 2024-03-12 tags: - attack.execution - attack.command-and-control - attack.stealth - attack.t1218.011 logsource: category: network_connection product: windows detection: selection: Image|endswith: \winlogon.exe Initiated: 'true' filter_main_local_ranges: DestinationIp|cidr: - 127.0.0.0/8 - 10.0.0.0/8 - 172.16.0.0/12 - 192.168.0.0/16 - 169.254.0.0/16 - ::1/128 - fe80::/10 - fc00::/7 condition: selection and not 1 of filter_main_* falsepositives: - Communication to other corporate systems that use IP addresses from public address spaces level: medium
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