Query: detection rule: Detects specific combinations of encoding methods in PowerShell via the commandline
Matching passage: Sigma rule: Detects specific combinations of encoding methods in PowerShell via the commandline. Logsource: windows / process_creation. Rule: title: Potential Encoded PowerShell Patterns In CommandLine id: cdf05894-89e7-4ead-b2b0-0a5f97a90f2f related: - id: 5b572dcf-254b-425c-a8c5-d9af6bea35a6 type: similar status: test description: Detects specific combinations of encoding methods in PowerShell via the commandline references: - https://speakerdeck.com/heirhabarov/hunting-for-powershell-abuse?slide=65 author: Teymur Kheirkhabarov (idea), Vasiliy Burov (rule), oscd.community, Tim Shelton date: 2020-10-11 modified: 2023-01-26 tags: - attack.stealth - attack.t1027 - attack.execution - attack.t1059.001 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - OriginalFileName: - PowerShell.EXE - pwsh.dll selection_to_1: CommandLine|contains: - ToInt - ToDecimal - ToByte - ToUint - ToSingle - ToSByte selection_to_2: CommandLine|contains: - ToChar - ToString - String selection_gen_1: CommandLine|contains|all: - char - join selection_gen_2: CommandLine|contains|all: - split - join condition: selection_img and (all of selection_to_* or 1 of selection_gen_*) falsepositives: - Unknown level: low
Near-miss passage: Sigma rule: Detects suspicious PowerShell invocation command parameters. Logsource: windows / ps_module. Rule: title: Suspicious PowerShell Invocations - Specific - PowerShell Module id: 8ff28fdd-e2fa-4dfa-aeda-ef3d61c62090 related: - id: fce5f582-cc00-41e1-941a-c6fabf0fdb8c type: obsolete - id: ae7fbf8e-f3cb-49fd-8db4-5f3bed522c71 type: similar - id: 536e2947-3729-478c-9903-745aaffe60d2 type: similar status: test description: Detects suspicious PowerShell invocation command parameters references: - Internal Research - https://github.com/HackTricks-wiki/hacktricks/blob/e4c7b21b8f36c97c35b7c622732b38a189ce18f7/src/windows-hardening/windows-local-privilege-escalation/privilege-escalation-with-autorun-binaries.md author: Florian Roth (Nextron Systems), Jonhnathan Ribeiro date: 2017-03-05 modified: 2025-02-17 tags: - attack.execution - attack.t1059.001 logsource: product: windows category: ps_module definition: 0ad03ef1-f21b-4a79-8ce8-e6900c54b65b detection: selection_convert_b64: ContextInfo|contains|all: - -nop - ' -w ' - hidden - ' -c ' - '[Convert]::FromBase64String' selection_iex: ContextInfo|contains|all: - ' -w ' - hidden - -noni - -nop - ' -c ' - iex - New-Object selection_enc: ContextInfo|contains|all: - ' -w ' - hidden - -ep - bypass - -Enc selection_reg: ContextInfo|contains|all: - powershell - reg - add ContextInfo|contains: - \software\microsoft\windows\currentversion\run - \software\wow6432node\microsoft\windows\currentversion\run - \software\microsoft\windows\currentversion\policies\explorer\run selection_webclient: ContextInfo|contains|all: - bypass - -noprofile - -windowstyle - hidden - new-object - system.net.webclient - .download selection_iex_webclient: ContextInfo|contains|all: - iex - New-Object - Net.WebClient - .Download filter_chocolatey: ContextInfo|contains: - (New-Object System.Net.WebClient).DownloadString('https://community.chocolatey.org/install.ps1 - Write-ChocolateyWarning condition: 1 of selection_* and not 1 of filter_* falsepositives: - Unknown level: high