process where host.os.type == "windows" and event.type == "start" and
 process.name : "powershell.exe" and

  not (
    user.id == "S-1-5-18" and
    /* Don't apply the user.id exclusion to Sysmon for compatibility */
    not event.dataset : ("windows.sysmon_operational", "windows.sysmon")
  ) and

  (
    process.command_line : (
          "*^*^*^*^*^*^*^*^*^*",
          "*`*`*`*`*",
          "*+*+*+*+*+*+*",
          "*[char[]](*)*-join*",
          "*Base64String*",
          "*[*Convert]*",
          "*.Compression.*",
          "*-join($*",
          "*.replace*",
          "*MemoryStream*",
          "*WriteAllBytes*",
          "* -enc *",
          "* -ec *",
          "* /e *",
          "* /enc *",
          "* /ec *",
          "*WebClient*",
          "*DownloadFile*",
          "*DownloadString*",
          "* iex*",
          "* iwr*",
          "* aQB3AHIAIABpA*",
          "*Reflection.Assembly*",
          "*Assembly.GetType*",
          "*$env:temp\\*start*",
          "*powercat*",
          "*nslookup -q=txt*",
          "*$host.UI.PromptForCredential*",
          "*Net.Sockets.TCPClient*",
          "*curl *;Start*",
          "powershell.exe \"<#*",
          "*ssh -p *",
          "*http*|iex*",
          "*@SSL\\DavWWWRoot\\*.ps1*",
          "*.lnk*.Seek(0x*",
          "*[string]::join(*",
          "*[Array]::Reverse($*",
          "* hidden $(gc *",
          "*=wscri& set*",
          "*http'+'s://*",
          "*.content|i''Ex*",
          "*//:sptth*",
          "*//:ptth*",
          "*h''t''t''p*",
          "*'tp'':''/'*",
          "*$env:T\"E\"MP*",
          "*;cmd /c $?",
          "*s''t''a''r*",
          "*$*=Get-Content*AppData*.SubString(*$*",
          "*=cat *AppData*.substring(*);*$*",
          "*-join'';*|powershell*",
          "*.Content;sleep *|powershell*",
          "*h\''t\''tp:\''*",
          "*-e aQB3AHIAIABp*",
          "*iwr *https*).Content*",
          "*$env:computername*http*",
          "*;InVoKe-ExpRESsIoN $COntent.CONTENt;*",
          "*WebClient*example.com*",
          "*=iwr $*;iex $*"
    ) or

    (process.args : "-c" and process.args : "&{'*") or

    (process.args : "-Outfile" and process.args : "Start*") or

    (process.args : "-bxor" and process.args : "0x*") or

    process.args : "$*$*;set-alias" or

    (
      process.parent.name : ("explorer.exe", "cmd.exe") and
      process.command_line : ("*-encodedCommand*", "*Invoke-webrequest*", "*WebClient*", "*Reflection.Assembly*"))
    )