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Hermes-IOC-scanner.ps1
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Hermes-IOC-scanner.ps1
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# Copyright 2023 Dany GIANG
#Script written by Dany Giang aka CyberMatters
param([Parameter(Mandatory=$true)]$IOC_location,[Parameter(Mandatory=$true)]$target_folder,[string[]]$include_file_extension,[string[]]$exclude_file_extension)
Clear-Host
Write-Host "`n"
Write-Host ******************************************`n
Write-Host ***************** HERMES *****************`n
Write-Host **** by Dany Giang aka CyberMatters ****`n
Write-Host ******************************************`n
$ioc_list = Import-Csv -Path $IOC_location -Delimiter ","
$file_time = Get-Date -Format "ddMMyyyy-hhmmss"
$computer = $env:computername
$outfile_name = ".\ioc-output-scanner-$computer-$file_time.csv"
$start_time = Get-Date -Format "dd/MM/yyyy hh:mm:ss"
if ($PSBoundParameters.ContainsKey('include_file_extension')){
foreach ($file in (Get-ChildItem -Path $target_folder -Recurse)){
$FullName = $file.FullName
if(Test-Path -Path $FullName -PathType Leaf){ #Check if item is a file
$match = $file.Name -match ".+\.(?<extension>.*$)" #file extension regex
$file_extension = $matches['extension']
if ($file_extension -in $include_file_extension){ #Apply file extension inclusion filter
try{
$signer1 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[0].split('=')[1]
$signer2 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[1].split('=')[1]
$signer3 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[2].split('=')[1]
if (($signer1 -ne "Microsoft Corporation") -and ($signer2 -ne "Microsoft Corporation") -and ($signer3 -ne "Microsoft Corporation")){#Do not scan files signed my Microsoft
$SHA256 = (Get-FileHash -Algorithm SHA256 -Path $FullName).Hash
$SHA1 = (Get-FileHash -Algorithm SHA1 -Path $FullName).Hash
$MD5 = (Get-FileHash -Algorithm MD5 -Path $FullName).Hash
Write-Output "Scanning $FullName"
foreach ($ioc in $ioc_list){
if ($SHA256 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA256'
'hash_value' = $SHA256
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA256 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA1'
'hash_value' = $SHA1
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA1 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'MD5'
'hash_value' = $MD5
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break
}
}
}
}catch{}
}
}
}
}
elseif ($PSBoundParameters.ContainsKey('exclude_file_extension')){
foreach ($file in (Get-ChildItem -Path $target_folder -Recurse)){
$FullName = $file.FullName
if(Test-Path -Path $FullName -PathType Leaf){ #Check if item is a file
$match = $file.Name -match ".+\.(?<extension>.*$)" #file extension regex
$file_extension = $matches['extension']
if ($file_extension -notin $exclude_file_extension){ #Apply file extension inclusion filter
try{
$signer1 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[0].split('=')[1]
$signer2 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[1].split('=')[1]
$signer3 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[2].split('=')[1]
if (($signer1 -ne "Microsoft Corporation") -and ($signer2 -ne "Microsoft Corporation") -and ($signer3 -ne "Microsoft Corporation")){ #Do not scan files signed my Microsoft
$SHA256 = (Get-FileHash -Algorithm SHA256 -Path $FullName).Hash
$SHA1 = (Get-FileHash -Algorithm SHA1 -Path $FullName).Hash
$MD5 = (Get-FileHash -Algorithm MD5 -Path $FullName).Hash
Write-Output "Scanning $FullName"
foreach ($ioc in $ioc_list){
if ($SHA256 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA256'
'hash_value' = $SHA256
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA256 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA1'
'hash_value' = $SHA1
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA1 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'MD5'
'hash_value' = $MD5
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break
}
}
}
}catch{}
}
}
}
}
else{
foreach ($file in (Get-ChildItem -Path $target_folder -Recurse)){
$FullName = $file.FullName
if(Test-Path -Path $FullName -PathType Leaf){ #Check if item is a file
try{
$signer1 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[0].split('=')[1]
$signer2 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[1].split('=')[1]
$signer3 = (Get-AuthenticodeSignature $fullname).SignerCertificate.subject.split(',')[2].split('=')[1]
if (($signer1 -ne "Microsoft Corporation") -and ($signer2 -ne "Microsoft Corporation") -and ($signer3 -ne "Microsoft Corporation")){ #Do not scan files signed my Microsoft
$SHA256 = (Get-FileHash -Algorithm SHA256 -Path $FullName).Hash
$SHA1 = (Get-FileHash -Algorithm SHA1 -Path $FullName).Hash
$MD5 = (Get-FileHash -Algorithm MD5 -Path $FullName).Hash
Write-Output "Scanning $FullName"
foreach ($ioc in $ioc_list){
if ($SHA256 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA256'
'hash_value' = $SHA256
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA256 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'SHA1'
'hash_value' = $SHA1
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break #If SHA1 matches, no need to compute SHA1
}
if ($SHA1 -eq $ioc.hash_value){
$newRow =[pscustomobject]@{
'filename' = $FullName
'hash_type' = 'MD5'
'hash_value' = $MD5
'description' = $ioc.description
}
$newRow | Export-Csv -Path $outfile_name -NoTypeInformation -Force -Append
break
}
}
}
}catch{}
}
}
}
$end_time = Get-Date -Format "dd/MM/yyyy hh:mm:ss"
$duration = NEW-TIMESPAN -Start $start_time -End $end_time
Write-Output "`r`nThe scan is finished`r`n"
Write-Output "Start time : $start_time"
Write-Output "End time : $end_time"
Write-Output "Duration : $duration"