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Add Filter to Exchange Processes #1965

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Merged
dpaulson45 merged 1 commit into from
Jan 30, 2024
Merged

Add Filter to Exchange Processes #1965

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48 changes: 22 additions & 26 deletions Diagnostics/AVTester/Test-ExchAVExclusions.ps1
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Original file line number Diff line number Diff line change
Expand Up @@ -301,13 +301,13 @@ Write-SimpleLogFile -String "Analyzing Exchange Processes" -LogFile $LogFileName
while ($currentDiff -gt 0) {
if ($firstExecution) {
# Test Exchange Processes for unexpected modules
$ProcessList = Get-ExchAVExclusionsProcess -ExchangePath $ExchangePath -MsiProductMinor ([byte]$serverExchangeInstallDirectory.MsiProductMinor)
$ExchangeProcessList = Get-ExchAVExclusionsProcess -ExchangePath $ExchangePath -MsiProductMinor ([byte]$serverExchangeInstallDirectory.MsiProductMinor)

# Include w3wp process in the analysis
$ProcessList += (Join-Path $env:SystemRoot '\System32\inetSrv\W3wp.exe')
$ExchangeProcessList += (Join-Path $env:SystemRoot '\System32\inetSrv\W3wp.exe')

# Gather all processes on the computer
$ServerProcess = Get-Process | Sort-Object -Property ProcessName
# Gather all processes on the computer and filter by the Exchange Process List
$ServerProcess = Get-Process | Where-Object { $ExchangeProcessList -contains $_.path } | Sort-Object -Property ProcessName

# Module allow list
$ModuleAllowList = New-Object Collections.Generic.List[string]
Expand Down Expand Up @@ -337,32 +337,28 @@ while ($currentDiff -gt 0) {
Write-Progress -Activity "Checking Exchange Processes" -CurrentOperation "$currentDiff More Seconds" -PercentComplete ((($initialDiff - $currentDiff) / $initialDiff) * 100) -Status " "
[int]$currentDiff = (New-TimeSpan -End $StartDate.AddMinutes($WaitingTimeForAVAnalysisInMinutes) -Start (Get-Date)).TotalSeconds

# Determine if it is a known exchange process
if ($ProcessList -contains $process.path ) {
# Gather all modules
[array]$ProcessModules = $process.modules

# Gather all modules
[array]$ProcessModules = $process.modules
# Remove Microsoft modules
$ProcessModules = $ProcessModules | Where-Object { $_.FileVersionInfo.CompanyName -ne "Microsoft Corporation." -and $_.FileVersionInfo.CompanyName -ne "Microsoft" -and $_.FileVersionInfo.CompanyName -ne "Microsoft Corporation" }

# Remove Microsoft modules
$ProcessModules = $ProcessModules | Where-Object { $_.FileVersionInfo.CompanyName -ne "Microsoft Corporation." -and $_.FileVersionInfo.CompanyName -ne "Microsoft" -and $_.FileVersionInfo.CompanyName -ne "Microsoft Corporation" }
# Remove Oracle modules on FIPS
$ProcessModules = $ProcessModules | Where-Object { (-not($_.FileName -like "*\FIP-FS\Bin\*" -and $_.FileVersionInfo.CompanyName -eq "Oracle Corporation")) }
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@dpaulson45 dpaulson45 Jan 30, 2024

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This appears to be a GitHub display issue for some reason. When doing this via a git command, it shows up correctly.


# Remove Oracle modules on FIPS
$ProcessModules = $ProcessModules | Where-Object { (-not($_.FileName -like "*\FIP-FS\Bin\*" -and $_.FileVersionInfo.CompanyName -eq "Oracle Corporation")) }

# Clear out modules from the allow list
foreach ($module in $ModuleAllowList) {
$ProcessModules = $ProcessModules | Where-Object { $_.ModuleName -ne $module -and $_.ModuleName -ne $($module.Replace(".dll", ".ni.dll")) }
}
# Clear out modules from the allow list
foreach ($module in $ModuleAllowList) {
$ProcessModules = $ProcessModules | Where-Object { $_.ModuleName -ne $module -and $_.ModuleName -ne $($module.Replace(".dll", ".ni.dll")) }
}

if ($ProcessModules.count -gt 0) {
foreach ($module in $ProcessModules) {
$OutString = ("PROCESS: $($process.ProcessName) PID($($process.Id)) UNEXPECTED MODULE: $($module.ModuleName) COMPANY: $($module.Company)`n`tPATH: $($module.FileName)")
Write-SimpleLogFile -string "[FAIL] - $OutString" -LogFile $LogFileName -OutHost
if ($process.MainModule.ModuleName -eq "W3wp.exe") {
$SuspiciousW3wpProcessList += $OutString
} else {
$SuspiciousProcessList += $OutString
}
if ($ProcessModules.count -gt 0) {
foreach ($module in $ProcessModules) {
$OutString = ("PROCESS: $($process.ProcessName) PID($($process.Id)) UNEXPECTED MODULE: $($module.ModuleName) COMPANY: $($module.Company)`n`tPATH: $($module.FileName)")
Write-SimpleLogFile -string "[FAIL] - $OutString" -LogFile $LogFileName -OutHost
if ($process.MainModule.ModuleName -eq "W3wp.exe") {
$SuspiciousW3wpProcessList += $OutString
} else {
$SuspiciousProcessList += $OutString
}
}
}
Expand Down