Query: write Sigma for Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections.
Matching passage: Sigma rule: Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections.. Logsource: windows / network_connection. Rule: title: Potentially Suspicious Wuauclt Network Connection id: c649a6c7-cd8c-4a78-9c04-000fc76df954 status: test description: 'Detects the use of the Windows Update Client binary (wuauclt.exe) to proxy execute code and making network connections. One could easily make the DLL spawn a new process and inject to it to proxy the network connection and bypass this rule. ' references: - https://dtm.uk/wuauclt/ author: Roberto Rodriguez (Cyb3rWard0g), OTR (Open Threat Research) date: 2020-10-12 modified: 2024-03-12 tags: - attack.stealth - attack.t1218 logsource: category: network_connection product: windows definition: 'Requirements: The CommandLine field enrichment is required in order for this rule to be used.' detection: selection: Image|contains: wuauclt CommandLine|contains: ' /RunHandlerComServer' filter_main_ip: DestinationIp|cidr: - 127.0.0.0/8 - 10.0.0.0/8 - 169.254.0.0/16 - 172.16.0.0/12 - 192.168.0.0/16 - ::1/128 - fe80::/10 - fc00::/7 filter_main_msrange: DestinationIp|cidr: - 20.184.0.0/13 - 20.192.0.0/10 - 23.79.0.0/16 - 51.10.0.0/15 - 51.103.0.0/16 - 51.104.0.0/15 - 52.224.0.0/11 filter_main_uus: CommandLine|contains: - :\Windows\UUS\Packages\Preview\amd64\updatedeploy.dll /ClassId - :\Windows\UUS\amd64\UpdateDeploy.dll /ClassId filter_main_winsxs: CommandLine|contains|all: - :\Windows\WinSxS\ - '\UpdateDeploy.dll /ClassId ' filter_main_cli_null: CommandLine: null filter_main_cli_empty: CommandLine: '' condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic".. Logsource: windows / process_creation. Rule: title: Suspicious Eventlog Clearing or Configuration Change Activity id: cc36992a-4671-4f21-a91d-6c2b72a2edf5 status: stable description: 'Detects the clearing or configuration tampering of EventLog using utilities such as "wevtutil", "powershell" and "wmic". This technique were seen used by threat actors and ransomware strains in order to evade defenses. ' references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1070.001/T1070.001.md - https://eqllib.readthedocs.io/en/latest/analytics/5b223758-07d6-4100-9e11-238cfdd0fe97.html - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/wevtutil - https://gist.github.com/fovtran/ac0624983c7722e80a8f5a4babb170ee - https://jdhnet.wordpress.com/2017/12/19/changing-the-location-of-the-windows-event-logs/ - https://www.linkedin.com/posts/huntress-labs_when-a-sketchy-incident-hits-your-network-activity-7304940371078238208-Th_l/?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAJTlRcB28IaUtg03HUU-IdliwzoAL1flGc - https://stackoverflow.com/questions/66011412/how-to-clear-a-event-log-in-powershell-7 - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventing.reader.eventlogsession.clearlog?view=windowsdesktop-9.0&viewFallbackFrom=dotnet-plat-ext-5.0#System_Diagnostics_Eventing_Reader_EventLogSession_ClearLog_System_String_ - https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.eventlog.clear author: Ecco, Daniil Yugoslavskiy, oscd.community, D3F7A5105, Swachchhanda Shrawan Poudel (Nextron Systems) date: 2019-09-26 modified: 2026-06-01 tags: - attack.defense-impairment - attack.t1685.005 - attack.t1685.001 - car.2016-04-002 logsource: category: process_creation product: windows detection: selection_wevtutil_img: - Image|endswith: \wevtutil.exe - OriginalFileName: wevtutil.exe selection_wevtutil_cmd: CommandLine|contains: - 'clear-log ' - ' cl ' - 'set-log ' - ' sl ' - 'lfn:' selection_other_ps_img: Image|endswith: - \powershell.exe - \powershell_ise.exe - \pwsh.exe selection_other_ps_cmd: - CommandLine|contains: - 'Clear-EventLog ' - 'Remove-EventLog ' - 'Limit-EventLog ' - 'Clear-WinEvent ' - CommandLine|contains|all: - Eventing.Reader.EventLogSession - ClearLog - CommandLine|contains|all: - Diagnostics.EventLog - Clear selection_other_wmi: Image|endswith: - \powershell.exe - \powershell_ise.exe - \pwsh.exe - \wmic.exe CommandLine|contains: ClearEventLog filter_main_msiexec: ParentImage: - C:\Windows\SysWOW