Query: detect Detects Windows executables that write files with suspicious extensions in logs
Matching passage: Sigma rule: Detects Windows executables that write files with suspicious extensions. Logsource: windows / file_event. Rule: title: Windows Binaries Write Suspicious Extensions id: b8fd0e93-ff58-4cbd-8f48-1c114e342e62 related: - id: 1277f594-a7d1-4f28-a2d3-73af5cbeab43 type: derived status: test description: Detects Windows executables that write files with suspicious extensions references: - Internal Research author: Nasreddine Bencherchali (Nextron Systems) date: 2022-08-12 modified: 2025-10-07 tags: - attack.stealth - attack.t1036 logsource: category: file_event product: windows detection: selection_generic: Image|endswith: - \csrss.exe - \lsass.exe - \RuntimeBroker.exe - \sihost.exe - \smss.exe - \wininit.exe - \winlogon.exe TargetFilename|endswith: - .bat - .dll - .exe - .hta - .iso - .ps1 - .txt - .vbe - .vbs selection_special: Image|endswith: - \dllhost.exe - \rundll32.exe - \svchost.exe TargetFilename|endswith: - .bat - .hta - .iso - .ps1 - .vbe - .vbs filter_main_AppLockerPolicyTest: Image: C:\Windows\System32\dllhost.exe TargetFilename|contains|all: - :\Users\ - \AppData\Local\Temp\__PSScriptPolicyTest_ TargetFilename|endswith: .ps1 filter_main_script_gpo_machine: Image: C:\Windows\system32\svchost.exe TargetFilename|contains|all: - C:\Windows\System32\GroupPolicy\DataStore\ - \sysvol\ - \Policies\ - \Machine\Scripts\Startup\ TargetFilename|endswith: - .ps1 - .bat filter_main_clipchamp: Image: C:\Windows\system32\svchost.exe TargetFilename|contains|all: - C:\Program Files\WindowsApps\Clipchamp - .ps1 filter_main_powershell_preview: Image: - C:\Windows\system32\svchost.exe - C:\Windows\SysWOW64\svchost.exe TargetFilename|startswith: - C:\Program Files\WindowsApps\Microsoft.PowerShellPreview - C:\Program Files (x86)\WindowsApps\Microsoft.PowerShellPreview TargetFilename|endswith: .ps1 condition: 1 of selection_* and not 1 of filter_main_* falsepositives: - Unknown level: high
Near-miss passage: Sigma rule: Detects the use of the "Get-ADComputer" cmdlet in order to identify systems which are configured for unconstrained deleg. Logsource: windows / ps_script. Rule: title: Potential Unconstrained Delegation Discovery Via Get-ADComputer - ScriptBlock id: cdfa73b6-3c9d-4bb8-97f8-ddbd8921f5c5 status: experimental description: Detects the use of the "Get-ADComputer" cmdlet in order to identify systems which are configured for unconstrained delegation. references: - https://pentestlab.blog/2022/03/21/unconstrained-delegation/ - https://learn.microsoft.com/en-us/powershell/module/activedirectory/get-adcomputer?view=windowsserver2022-ps author: frack113 date: 2025-03-05 tags: - attack.reconnaissance - attack.discovery - attack.credential-access - attack.t1018 - attack.t1558 - attack.t1589.002 logsource: product: windows category: ps_script definition: 'Requirements: Script Block Logging must be enable' detection: selection: ScriptBlockText|contains: - -Properties*TrustedForDelegation - -Properties*TrustedToAuthForDelegation - -Properties*msDS-AllowedToDelegateTo - -Properties*PrincipalsAllowedToDelegateToAccount - -LDAPFilter*(userAccountControl:1.2.840.113556.1.4.803:=524288) condition: selection falsepositives: - Legitimate use of the library for administrative activity level: medium