Created
June 15, 2021 21:38
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Slimmed Down Version of the Deep Blue CLI Tool
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| param ([string]$file = $env:file, [string]$log = $env:log) | |
| function Main { | |
| $text = "" | |
| $minlength = 1000 | |
| $regexes = Get-Content ".\regexes.txt" | Select-String '^[^#]' | ConvertFrom-Csv | |
| $whitelist = Get-Content ".\whitelist.txt" | Select-String '^[^#]' | ConvertFrom-Csv | |
| $logname = Check-Options $file $log | |
| $filter = Create-Filter $file $logname | |
| $maxfailedlogons = 5 | |
| $failedlogons = @{} | |
| $totalfailedlogons = 0 | |
| $totalfailedaccounts = 0 | |
| $totalsensprivuse = 0 | |
| $maxtotalsensprivuse = 4 | |
| $totaladminlogons = 0 | |
| $maxadminlogons = 10 | |
| $adminlogons = @{} | |
| $multipleadminlogons = @{} | |
| $alert_all_admin = 0 | |
| $minpercent = .65 | |
| $maxbinary = .50 | |
| $passspraytrack = @{} | |
| $passsprayuniqusermax = 6 | |
| $passsprayloginmax = 6 | |
| $checkunsigned = 0 | |
| try { | |
| $events = Invoke-Expression "Get-WinEvent $filter -ErrorAction Stop" | |
| } | |
| catch { | |
| Write-Host "Get-WinEvent $filter -ErrorAction Stop" | |
| Write-Host "Get-WinEvent error: " $_.Exception.Message "`n" | |
| Write-Host "Exiting...`n" | |
| exit | |
| } | |
| ForEach ($event in $events) { | |
| # Custom reporting object: | |
| $obj = [PSCustomObject]@{ | |
| Date = $event.TimeCreated | |
| Log = $logname | |
| EventID = $event.id | |
| Message = $event.message | |
| Results = "" | |
| Command = "" | |
| Decoded = "" | |
| } | |
| $eventXML = [xml]$event.ToXml() | |
| $servicecmd = 0 # CLIs via service creation get extra checks, this defaults to 0 (no extra checks) | |
| if ($logname -eq "Security") { | |
| if ($event.id -eq 4688) { | |
| # A new process has been created. (Command Line Logging) | |
| $commandline = $eventXML.Event.EventData.Data[8]."#text" # Process Command Line | |
| $creator = $eventXML.Event.EventData.Data[13]."#text" # Creator Process Name | |
| if ($commandline) { | |
| Check-Command -EventID 4688 | |
| } | |
| } | |
| ElseIf ($event.id -eq 4672) { | |
| # Special privileges assigned to new logon (possible admin access) | |
| $username = $eventXML.Event.EventData.Data[1]."#text" | |
| $domain = $eventXML.Event.EventData.Data[2]."#text" | |
| $securityid = $eventXML.Event.EventData.Data[3]."#text" | |
| $privileges = $eventXML.Event.EventData.Data[4]."#text" | |
| if ($privileges -Match "SeDebugPrivilege") { | |
| #Admin account with SeDebugPrivilege | |
| if ($alert_all_admin) { | |
| # Alert for every admin logon | |
| $obj.Message = "Logon with SeDebugPrivilege (admin access)" | |
| $obj.Results = "Username: $username`n" | |
| $obj.Results += "Domain: $domain`n" | |
| $obj.Results += "User SID: $securityid`n" | |
| $obj.Results += "Privileges: $privileges" | |
| Write-Output $obj | |
| } | |
| # Track User SIDs used during admin logons (can track one account logging into multiple systems) | |
| $totaladminlogons += 1 | |
| if ($adminlogons.ContainsKey($username)) { | |
| $string = $adminlogons.$username | |
| if (-Not ($string -Match $securityid)) { | |
| # One username with multiple admin logon SIDs | |
| $multipleadminlogons.Set_Item($username, 1) | |
| $string += " $securityid" | |
| $adminlogons.Set_Item($username, $string) | |
| } | |
| } | |
| Else { | |
| $adminlogons.add($username, $securityid) | |
| } | |
| } | |
| } | |
| ElseIf ($event.id -eq 4720) { | |
| # A user account was created. | |
| $username = $eventXML.Event.EventData.Data[0]."#text" | |
| $securityid = $eventXML.Event.EventData.Data[2]."#text" | |
| $obj.Message = "New User Created" | |
| $obj.Results = "Username: $username`n" | |
| $obj.Results += "User SID: $securityid`n" | |
| Write-Output $obj | |
| } | |
| ElseIf (($event.id -eq 4728) -or ($event.id -eq 4732) -or ($event.id -eq 4756)) { | |
| # A member was added to a security-enabled (global|local|universal) group. | |
| $groupname = $eventXML.Event.EventData.Data[2]."#text" | |
| # Check if group is Administrators, may later expand to all groups | |
| if ($groupname -eq "Administrators") { | |
| $username = $eventXML.Event.EventData.Data[0]."#text" | |
| $securityid = $eventXML.Event.EventData.Data[1]."#text" | |
| switch ($event.id) { | |
| 4728 { $obj.Message = "User added to global $groupname group" } | |
| 4732 { $obj.Message = "User added to local $groupname group" } | |
| 4756 { $obj.Message = "User added to universal $groupname group" } | |
| } | |
| $obj.Results = "Username: $username`n" | |
| $obj.Results += "User SID: $securityid`n" | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($event.id -eq 4625) { | |
| # An account failed to log on. | |
| # Requires auditing logon failures | |
| # https://technet.microsoft.com/en-us/library/cc976395.aspx | |
| $totalfailedlogons += 1 | |
| $username = $eventXML.Event.EventData.Data[5]."#text" | |
| if ($failedlogons.ContainsKey($username)) { | |
| $count = $failedlogons.Get_Item($username) | |
| $failedlogons.Set_Item($username, $count + 1) | |
| } | |
| Else { | |
| $failedlogons.Set_Item($username, 1) | |
| $totalfailedaccounts += 1 | |
| } | |
| } | |
| ElseIf ($event.id -eq 4673) { | |
| # Sensitive Privilege Use (Mimikatz) | |
| $totalsensprivuse += 1 | |
| # use -eq here to avoid multiple log notices | |
| if ($totalsensprivuse -eq $maxtotalsensprivuse) { | |
| $obj.Message = "Sensititive Privilege Use Exceeds Threshold" | |
| $obj.Results = "Potentially indicative of Mimikatz, multiple sensitive privilege calls have been made.`n" | |
| $username = $eventXML.Event.EventData.Data[1]."#text" | |
| $domainname = $eventXML.Event.EventData.Data[2]."#text" | |
| $obj.Results += "Username: $username`n" | |
| $obj.Results += "Domain Name: $domainname`n" | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($event.id -eq 4674) { | |
| if ($event.Message) { | |
| $text = $array[0] | |
| $application = Remove-Spaces($array[3]) | |
| $user = Remove-Spaces(($array[4] -split ':')[1]) | |
| $service = Remove-Spaces(($array[11] -split ':')[1]) | |
| $application = Remove-Spaces(($array[16] -split ': ')[1]) | |
| $accessreq = Remove-Spaces(($array[19] -split ':')[1]) | |
| if ($application.ToUpper() -Eq "C:\WINDOWS\SYSTEM32\SERVICES.EXE" ` | |
| -And $accessreq.ToUpper() -Match "WRITE_DAC") { | |
| $obj.Message = "Possible Hidden Service Attempt" | |
| $obj.Command = "" | |
| $obj.Results = "User requested to modify the Dynamic Access Control (DAC) permissions of a service, possibly to hide it from view.`n" | |
| $obj.Results += "User: $user`n" | |
| $obj.Results += "Target service: $service`n" | |
| $obj.Results += "Desired Access: $accessreq`n" | |
| Write-Output $obj | |
| } | |
| } | |
| } | |
| ElseIf ($event.id -eq 4648) { | |
| $username = $eventXML.Event.EventData.Data[1]."#text" | |
| $hostname = $eventXML.Event.EventData.Data[2]."#text" | |
| $targetusername = $eventXML.Event.EventData.Data[5]."#text" | |
| $sourceip = $eventXML.Event.EventData.Data[12]."#text" | |
| if ($passspraytrack[$targetusername] -eq $null) { | |
| $passspraytrack[$targetusername] = 1 | |
| } | |
| else { | |
| $passspraytrack[$targetusername] += 1 | |
| } | |
| if ($passspraytrack[$targetusername] -gt $passsprayloginmax) { | |
| $passsprayuniquser = 0 | |
| foreach ($key in $passspraytrack.keys) { | |
| if ($passspraytrack[$key] -gt $passsprayloginmax) { | |
| $passsprayuniquser += 1 | |
| } | |
| } | |
| if ($passsprayuniquser -gt $passsprayuniqusermax) { | |
| $usernames = "" | |
| foreach ($key in $passspraytrack.keys) { | |
| $usernames += $key | |
| $usernames += " " | |
| } | |
| $obj.Message = "Distributed Account Explicit Credential Use (Password Spray Attack)" | |
| $obj.Results = "The use of multiple user account access attempts with explicit credentials is " | |
| $obj.Results += "an indicator of a password spray attack.`n" | |
| $obj.Results += "Target Usernames: $usernames`n" | |
| $obj.Results += "Accessing Username: $username`n" | |
| $obj.Results += "Accessing Host Name: $hostname`n" | |
| Write-Output $obj | |
| $passspraytrack = @{} # Reset | |
| } | |
| } | |
| } | |
| ElseIf ($event.id -eq 1102) { | |
| # The Audit log file was cleared. | |
| if ($event.Message) { | |
| $array = $event.message -split '\n' # Split each line of the message into an array | |
| $user = Remove-Spaces($array[3]) | |
| } | |
| $obj.Message = "Audit Log Clear" | |
| $obj.Results = "The Audit log was cleared.`n" | |
| $obj.Results += $user | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($logname -eq "System") { | |
| if ($event.id -eq 7045) { | |
| # A service was installed in the system. | |
| $servicename = $eventXML.Event.EventData.Data[0]."#text" | |
| $commandline = $eventXML.Event.EventData.Data[1]."#text" | |
| # Check for suspicious service name | |
| $text = (Check-Regex $servicename 1) | |
| if ($text) { | |
| $obj.Message = "New Service Created" | |
| $obj.Command = $commandline | |
| $obj.Results = "Service name: $servicename`n" | |
| $obj.Results += $text | |
| Write-Output $obj | |
| } | |
| # Check for suspicious cmd | |
| if ($commandline) { | |
| $servicecmd = 1 # CLIs via service creation get extra checks | |
| Check-Command -EventID 7045 | |
| } | |
| } | |
| ElseIf ($event.id -eq 7030) { | |
| # The ... service is marked as an interactive service. However, the system is configured | |
| # to not allow interactive services. This service may not function properly. | |
| $servicename = $eventXML.Event.EventData.Data."#text" | |
| $obj.Message = "Interactive service warning" | |
| $obj.Results = "Service name: $servicename`n" | |
| $obj.Results += "Malware (and some third party software) trigger this warning" | |
| # Check for suspicious service name | |
| $servicecmd = 1 # CLIs via service creation get extra check | |
| $obj.Results += (Check-Regex $servicename 1) | |
| Write-Output $obj | |
| } | |
| ElseIf ($event.id -eq 7036) { | |
| # The ... service entered the stopped|running state. | |
| $servicename = $eventXML.Event.EventData.Data[0]."#text" | |
| $text = (Check-Regex $servicename 1) | |
| if ($text) { | |
| $obj.Message = "Suspicious Service Name" | |
| $obj.Results = "Service name: $servicename`n" | |
| $obj.Results += $text | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($event.id -eq 7040) { | |
| # The start type of the Windows Event Log service was changed from auto start to disabled. | |
| $servicename = $eventXML.Event.EventData.Data[0]."#text" | |
| $action = $eventXML.Event.EventData.Data[1]."#text" | |
| if ($servicename -ccontains "Windows Event Log") { | |
| $obj.Results = "Service name: $servicename`n" | |
| $obj.Results += $text | |
| if ($action -eq "disabled") { | |
| $obj.Message = "Event Log Service Stopped" | |
| $obj.Results += "Selective event log manipulation may follow this event." | |
| } | |
| elseIf ($action -eq "auto start") { | |
| $obj.Message = "Event Log Service Started" | |
| $obj.Results += "Selective event log manipulation may precede this event." | |
| } | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($event.id -eq 104) { | |
| # The System log file was cleared. | |
| $obj.Message = "System Log Clear" | |
| $obj.Results = $event.message | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($logname -eq "Application") { | |
| if (($event.id -eq 2) -and ($event.Providername -eq "EMET")) { | |
| # EMET Block | |
| $obj.Message = "EMET Block" | |
| if ($event.Message) { | |
| $array = $event.message -split '\n' # Split each line of the message into an array | |
| $text = $array[0] | |
| $application = Remove-Spaces($array[3]) | |
| $command = $application -Replace "^Application: ", "" | |
| $username = Remove-Spaces($array[4]) | |
| $obj.Message = "EMET Block" | |
| $obj.Command = "$command" | |
| $obj.Results = "$text`n" | |
| $obj.Results += "$username`n" | |
| } | |
| Else { | |
| $obj.Message = "Warning: EMET Message field is blank. Install EMET locally to see full details of this alert" | |
| } | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($logname -eq "Applocker") { | |
| if ($event.id -eq 8003) { | |
| $obj.Message = "Applocker Warning" | |
| $command = $event.message -Replace " was .*$", "" | |
| $obj.Command = $command | |
| $obj.Results = $event.message | |
| Write-Output $obj | |
| } | |
| ElseIf ($event.id -eq 8004) { | |
| $obj.Message = "Applocker Block" | |
| $command = $event.message -Replace " was .*$", "" | |
| $obj.Command = $command | |
| $obj.Results = $event.message | |
| Write-Output $obj | |
| } | |
| } | |
| ElseIf ($logname -eq "PowerShell") { | |
| if ($event.id -eq 4103) { | |
| $commandline = $eventXML.Event.EventData.Data[2]."#text" | |
| if ($commandline -Match "Host Application") { | |
| $commandline = $commandline -Replace "(?ms)^.*Host.Application = ", "" | |
| # Remove every line after the "Host Application = " line. | |
| $commandline = $commandline -Replace "(?ms)`n.*$", "" | |
| if ($commandline) { | |
| Check-Command -EventID 4103 | |
| } | |
| } | |
| } | |
| ElseIf ($event.id -eq 4104) { | |
| if (-not ($eventxml.Event.EventData.Data[4]."#text")) { | |
| $commandline = $eventXML.Event.EventData.Data[2]."#text" | |
| if ($commandline) { | |
| Check-Command -EventID 4104 | |
| } | |
| } | |
| } | |
| } | |
| ElseIf ($logname -eq "Sysmon") { | |
| # Check command lines | |
| if ($event.id -eq 1) { | |
| $creator = $eventXML.Event.EventData.Data[14]."#text" | |
| $commandline = $eventXML.Event.EventData.Data[4]."#text" | |
| if ($commandline) { | |
| Check-Command -EventID 1 | |
| } | |
| } | |
| ElseIf ($event.id -eq 7) { | |
| if ($checkunsigned) { | |
| if ($eventXML.Event.EventData.Data[6]."#text" -eq "false") { | |
| $obj.Message = "Unsigned Image (DLL)" | |
| $image = $eventXML.Event.EventData.Data[3]."#text" | |
| $imageload = $eventXML.Event.EventData.Data[4]."#text" | |
| # $hash=$eventXML.Event.EventData.Data[5]."#text" | |
| $obj.Command = $imageload | |
| $obj.Results = "Loaded by: $image" | |
| Write-Output $obj | |
| } | |
| } | |
| } | |
| } | |
| } | |
| foreach ($username in $adminlogons.Keys) { | |
| $securityid = $adminlogons.Get_Item($username) | |
| if ($multipleadminlogons.$username) { | |
| $obj.Message = "Multiple admin logons for one account" | |
| $obj.Results = "Username: $username`n" | |
| $obj.Results += "User SID Access Count: " + $securityid.split().Count | |
| $obj.EventId = 4672 | |
| Write-Output $obj | |
| } | |
| } | |
| foreach ($username in $failedlogons.Keys) { | |
| $count = $failedlogons.Get_Item($username) | |
| if ($count -gt $maxfailedlogons) { | |
| $obj.Message = "High number of logon failures for one account" | |
| $obj.Results = "Username: $username`n" | |
| $obj.Results += "Total logon failures: $count" | |
| $obj.EventId = 4625 | |
| Write-Output $obj | |
| } | |
| } | |
| # Password spraying: | |
| if (($totalfailedlogons -gt $maxfailedlogons) -and ($totalfailedaccounts -gt 1)) { | |
| $obj.Message = "High number of total logon failures for multiple accounts" | |
| $obj.Results = "Total accounts: $totalfailedaccounts`n" | |
| $obj.Results += "Total logon failures: $totalfailedlogons`n" | |
| $obj.EventId = 4625 | |
| Write-Output $obj | |
| } | |
| } | |
| function Check-Options($file, $log) { | |
| $log_error = "Unknown and/or unsupported log type" | |
| $logname = "" | |
| # Checks the command line options, return logname to parse | |
| if ($file -eq "") { | |
| # No filename provided, parse local logs | |
| if (($log -eq "") -or ($log -eq "Security")) { | |
| # Parse the security log if no log was selected | |
| $logname = "Security" | |
| } | |
| ElseIf ($log -eq "System") { | |
| $logname = "System" | |
| } | |
| ElseIf ($log -eq "Application") { | |
| $logname = "Application" | |
| } | |
| ElseIf ($log -eq "Sysmon") { | |
| $logname = "Sysmon" | |
| } | |
| ElseIf ($log -eq "Powershell") { | |
| $logname = "Powershell" | |
| } | |
| Else { | |
| write-host $log_error | |
| exit 1 | |
| } | |
| } | |
| else { | |
| if (Test-Path $file) { | |
| try { | |
| $event = Get-WinEvent -path $file -max 1 -ErrorAction Stop | |
| } | |
| catch { | |
| Write-Host "Get-WinEvent error: " $_.Exception.Message "`n" | |
| Write-Host "Exiting...`n" | |
| exit | |
| } | |
| switch ($event.LogName) { | |
| "Security" { $logname = "Security" } | |
| "System" { $logname = "System" } | |
| "Application" { $logname = "Application" } | |
| "Microsoft-Windows-AppLocker/EXE and DLL" { $logname = "Applocker" } | |
| "Microsoft-Windows-PowerShell/Operational" { $logname = "Powershell" } | |
| "Microsoft-Windows-Sysmon/Operational" { $logname = "Sysmon" } | |
| default { "Logic error 3, should not reach here..."; Exit 1 } | |
| } | |
| } | |
| else { | |
| # Filename does not exist, exit | |
| Write-host "Error: no such file. Exiting..." | |
| exit 1 | |
| } | |
| } | |
| return $logname | |
| } | |
| function Create-Filter($file, $logname) { | |
| # Return the Get-Winevent filter | |
| # | |
| $sys_events = "7030,7036,7045,7040,104" | |
| $sec_events = "4688,4672,4720,4728,4732,4756,4625,4673,4674,4648,1102" | |
| $app_events = "2" | |
| $applocker_events = "8003,8004,8006,8007" | |
| $powershell_events = "4103,4104" | |
| $sysmon_events = "1,7" | |
| if ($file -ne "") { | |
| switch ($logname) { | |
| "Security" { $filter = "@{path=""$file"";ID=$sec_events}" } | |
| "System" { $filter = "@{path=""$file"";ID=$sys_events}" } | |
| "Application" { $filter = "@{path=""$file"";ID=$app_events}" } | |
| "Applocker" { $filter = "@{path=""$file"";ID=$applocker_events}" } | |
| "Powershell" { $filter = "@{path=""$file"";ID=$powershell_events}" } | |
| "Sysmon" { $filter = "@{path=""$file"";ID=$sysmon_events}" } | |
| default { "Logic error 1, should not reach here..."; Exit 1 } | |
| } | |
| } | |
| else { | |
| switch ($logname) { | |
| "Security" { $filter = "@{Logname=""Security"";ID=$sec_events}" } | |
| "System" { $filter = "@{Logname=""System"";ID=$sys_events}" } | |
| "Application" { $filter = "@{Logname=""Application"";ID=$app_events}" } | |
| "Applocker" { $filter = "@{logname=""Microsoft-Windows-AppLocker/EXE and DLL"";ID=$applocker_events}" } | |
| "Powershell" { $filter = "@{logname=""Microsoft-Windows-PowerShell/Operational"";ID=$powershell_events}" } | |
| "Sysmon" { $filter = "@{logname=""Microsoft-Windows-Sysmon/Operational"";ID=$sysmon_events}" } | |
| default { "Logic error 2, should not reach here..."; Exit 1 } | |
| } | |
| } | |
| return $filter | |
| } | |
| function Check-Command() { | |
| Param($EventID) | |
| $text = "" | |
| $base64 = "" | |
| # Check to see if command is whitelisted | |
| foreach ($entry in $whitelist) { | |
| if ($commandline -Match $entry.regex) { | |
| # Command is whitelisted, return nothing | |
| return | |
| } | |
| } | |
| if ($commandline.length -gt $minlength) { | |
| $text += "Long Command Line: greater than $minlength bytes`n" | |
| } | |
| $text += (Check-Obfu $commandline) | |
| $text += (Check-Regex $commandline 0) | |
| $text += (Check-Creator $commandline $creator) | |
| if ($commandline -Match "\-enc.*[A-Za-z0-9/+=]{100}") { | |
| $base64 = $commandline -Replace "^.* \-Enc(odedCommand)? ", "" | |
| } | |
| ElseIf ($commandline -Match ":FromBase64String\(") { | |
| $base64 = $commandline -Replace "^.*:FromBase64String\(\'*", "" | |
| $base64 = $base64 -Replace "\'.*$", "" | |
| } | |
| if ($base64) { | |
| if ($commandline -Match "Compression.GzipStream.*Decompress") { | |
| # Metasploit-style compressed and base64-encoded function. Uncompress it. | |
| $decoded = New-Object IO.MemoryStream(, [Convert]::FromBase64String($base64)) | |
| $uncompressed = (New-Object IO.StreamReader(((New-Object IO.Compression.GzipStream($decoded, [IO.Compression.CompressionMode]::Decompress))), [Text.Encoding]::ASCII)).ReadToEnd() | |
| $obj.Decoded = $uncompressed | |
| $text += "Base64-encoded and compressed function`n" | |
| } | |
| else { | |
| $decoded = [System.Text.Encoding]::Unicode.GetString([System.Convert]::FromBase64String($base64)) | |
| $obj.Decoded = $decoded | |
| $text += "Base64-encoded function`n" | |
| $text += (Check-Obfu $decoded) | |
| $text += (Check-Regex $decoded 0) | |
| } | |
| } | |
| if ($text) { | |
| if ($servicecmd) { | |
| $obj.Message = "Suspicious Service Command" | |
| $obj.Results = "Service name: $servicename`n" | |
| } | |
| Else { | |
| $obj.Message = "Suspicious Command Line" | |
| } | |
| $obj.Command = $commandline | |
| $obj.Results += $text | |
| $obj.EventID = $EventID | |
| Write-Output $obj | |
| } | |
| return | |
| } | |
| function Check-Regex($string, $type) { | |
| $regextext = "" # Local variable for return output | |
| foreach ($regex in $regexes) { | |
| if ($regex.Type -eq $type) { | |
| # Type is 0 for Commands, 1 for services. Set in regexes.csv | |
| if ($string -Match $regex.regex) { | |
| $regextext += $regex.String + "`n" | |
| } | |
| } | |
| } | |
| return $regextext | |
| } | |
| function Check-Obfu($string) { | |
| $obfutext = "" # Local variable for return output | |
| $lowercasestring = $string.ToLower() | |
| $length = $lowercasestring.length | |
| $noalphastring = $lowercasestring -replace "[a-z0-9/\;:|.]" | |
| $nobinarystring = $lowercasestring -replace "[01]" # To catch binary encoding | |
| # Calculate the percent alphanumeric/common symbols | |
| if ($length -gt 0) { | |
| $percent = (($length - $noalphastring.length) / $length) | |
| # Adjust minpercent for very short commands, to avoid triggering short warnings | |
| if (($length / 100) -lt $minpercent) { | |
| $minpercent = ($length / 100) | |
| } | |
| if ($percent -lt $minpercent) { | |
| $percent = "{0:P0}" -f $percent # Convert to a percent | |
| $obfutext += "Possible command obfuscation: only $percent alphanumeric and common symbols`n" | |
| } | |
| # Calculate the percent of binary characters | |
| $percent = (($nobinarystring.length - $length / $length) / $length) | |
| $binarypercent = 1 - $percent | |
| if ($binarypercent -gt $maxbinary) { | |
| #$binarypercent = 1-$percent | |
| $binarypercent = "{0:P0}" -f $binarypercent # Convert to a percent | |
| $obfutext += "Possible command obfuscation: $binarypercent zeroes and ones (possible numeric or binary encoding)`n" | |
| } | |
| } | |
| return $obfutext | |
| } | |
| function Check-Creator($command, $creator) { | |
| $creatortext = "" | |
| if ($creator) { | |
| if ($command -Match "powershell") { | |
| if ($creator -Match "PSEXESVC") { | |
| $creatortext += "PowerShell launched via PsExec: $creator`n" | |
| } | |
| ElseIf ($creator -Match "WmiPrvSE") { | |
| $creatortext += "PowerShell launched via WMI: $creator`n" | |
| } | |
| } | |
| } | |
| return $creatortext | |
| } | |
| function Remove-Spaces($string) { | |
| $string = $string.trim() -Replace "\s+:", ":" | |
| return $string | |
| } | |
| . Main |
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