Detectionhightest

HackTool - Evil-WinRm Execution - PowerShell Module

Detects the execution of Evil-WinRM via PowerShell Module logs by leveraging the hardcoded strings inside the utility.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

Launch

Nasreddine Bencherchali (Nextron Systems)Created Sun Feb 259fe55ea2-4cd6-4491-8a54-dd6871651b51windows

Log Source

WindowsPowerShell Module

ProductWindows← raw: windows

CategoryPowerShell Module← raw: ps_module

Detection Logic

detection:
    selection_wsm:
        ContextInfo|contains:
            - ':\Windows\System32\wsmprovhost.exe'
            - ':\Windows\SysWOW64\wsmprovhost.exe'
    selection_payload_1:
        Payload|contains:
            - value="(get-location).path # https://github.com/Hackplayers/evil-winrm/blob/7514b055d67ec19836e95c05bd63e7cc47c4c2aa/evil-winrm.rb#L592
            - value="(get-item*).length # https://github.com/Hackplayers/evil-winrm/blob/7514b055d67ec19836e95c05bd63e7cc47c4c2aa/evil-winrm.rb#L490
            - 'Invoke-Binary ' # https://github.com/Hackplayers/evil-winrm/blob/7514b055d67ec19836e95c05bd63e7cc47c4c2aa/evil-winrm.rb#L740
            - Donut-Loader -process_id*-donutfile # https://github.com/Hackplayers/evil-winrm/blob/7514b055d67ec19836e95c05bd63e7cc47c4c2aa/evil-winrm.rb#L761
            - Bypass-4MSI
            - IEX ([System.Text.Encoding]::ASCII.GetString([System.Convert]::FromBase64String($a))).replace('???','')
    selection_payload_2:
        Payload|contains|all:
            - $servicios = Get-ItemProperty "registry::HKLM\System\CurrentControlSet\Services\"
            - Where-Object {$_.imagepath -notmatch "system" -and $_.imagepath -ne $null } | Select-Object pschildname,imagepath
    selection_payload_3:
        Payload|contains|all:
            - $a +=  \"$($_.FullName.Replace('\\','/'))/\"}else{  $a += \"$($_.FullName.Replace('\\', '/'))\" } # https://github.com/Hackplayers/evil-winrm/blob/7514b055d67ec19836e95c05bd63e7cc47c4c2aa/evil-winrm.rb#L1001
            - $a=@();$
    condition: selection_wsm and 1 of selection_payload_*