259 lines
12 KiB
PowerShell
259 lines
12 KiB
PowerShell
<#
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.SYNOPSIS
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Offline (WinPE / WinRE) neutralization of Sophos Endpoint tamper protection
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so that SophosZap can complete removal after a single reboot.
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.DESCRIPTION
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Inherited-MSP Sophos installs with NO Sophos Central access cannot be removed
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from inside Windows: tamper protection is enforced by a boot-start kernel
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driver (SophosED.sys / SophosEL.sys), and SophosZap refuses to run while the
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registry flag SEDEnabled = 1.
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Run this from a PowerShell prompt in WinPE / WinRE (NOT normal Windows),
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pointed at the OFFLINE Windows volume. It performs every edit needed so that
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after ONE reboot, SophosZap --confirm runs cleanly:
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1. Renames Sophos*.sys driver files -> .old (cannot load at boot)
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2. Sets the "Sophos Endpoint Defense" service Start = 4 (Disabled)
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3. Clears the tamper flags SEDEnabled = 0 and IgnoreSAV = 0
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It asks for the Windows drive letter, proves the volume is really Windows
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(not the ~600 MB recovery partition), shows you the current values before
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changing anything, and confirms at every destructive step.
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.NOTES
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Origin : Built from the Lone Star Electrical LS-1 removal, 2026-06-02.
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Run from : WinPE / WinRE -> Command Prompt -> powershell (or a PE with PS).
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Requires : the target Windows volume must be UNLOCKED. If BitLocker is on,
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System32\config\SYSTEM is unreadable -- unlock with the recovery
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key first (manage-bde -unlock X: -RecoveryPassword <key>), or
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confirm BitLocker OFF from normal Windows before booting to PE.
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AFTER this script:
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a. Remove the PE USB.
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b. Reboot into normal Windows.
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c. Run: SophosZap.exe --confirm (pass 1 -- bulk removal)
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d. Reboot when it says "reboot and re-execute".
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e. Run: SophosZap.exe --confirm (pass 2 -- finishes the job)
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f. Verify: no Sophos services, drivers, folders, or Add/Remove entries;
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Windows Defender real-time protection ON.
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#>
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[CmdletBinding()]
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param()
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$ErrorActionPreference = 'Stop'
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$HiveMount = 'HKLM\OFFSYS' # temporary mount point for the offline SYSTEM hive
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function Write-Head([string]$t) { Write-Host ""; Write-Host "==== $t ====" -ForegroundColor Cyan }
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function Write-Ok ([string]$t) { Write-Host " [OK] $t" -ForegroundColor Green }
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function Write-Warn([string]$t) { Write-Host " [WARN] $t" -ForegroundColor Yellow }
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function Write-Err ([string]$t) { Write-Host " [ERROR] $t" -ForegroundColor Red }
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function Confirm-Step([string]$Message) {
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$ans = Read-Host "$Message [y/N]"
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return ($ans.Trim() -match '^(y|yes)$')
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}
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Write-Host @"
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============================================================
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Sophos Offline Removal (PE) - tamper-protection neutralizer
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============================================================
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This edits an OFFLINE Windows volume. Make sure you are in
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WinPE/WinRE, NOT the live Windows you want to clean.
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"@ -ForegroundColor White
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try {
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# ---------------------------------------------------------------------------
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# 1. Identify and validate the Windows drive letter
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# ---------------------------------------------------------------------------
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Write-Head "Step 1 - Identify the offline Windows volume"
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Write-Host "Volumes visible in this PE session:"
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Get-Volume -ErrorAction SilentlyContinue |
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Where-Object DriveLetter |
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Select-Object DriveLetter, FileSystemLabel,
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@{n='Size(GB)';e={[math]::Round($_.Size/1GB,1)}},
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@{n='Free(GB)';e={[math]::Round($_.SizeRemaining/1GB,1)}} |
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Format-Table -AutoSize | Out-String | Write-Host
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$drive = $null
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do {
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$entry = (Read-Host "Enter the Windows drive letter as shown HERE in PE (e.g. C, D, E)").Trim().TrimEnd(':')
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if ($entry -notmatch '^[A-Za-z]$') { Write-Warn "Enter a single letter."; continue }
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$win = "${entry}:\Windows"
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$hive = "${entry}:\Windows\System32\config\SYSTEM"
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if (-not (Test-Path $win)) { Write-Warn "$win not found -- that is not the Windows volume."; continue }
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if (-not (Test-Path $hive)) { Write-Warn "$hive not found -- volume locked by BitLocker? Unlock it first."; continue }
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$drive = $entry.ToUpper()
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} while (-not $drive)
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# Prove it is the real OS volume, not the recovery partition
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Write-Host ""
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Write-Host "Evidence that ${drive}: is the real Windows volume:"
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foreach ($p in 'Windows','Windows\System32','Windows\System32\config','Users','Program Files') {
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$present = Test-Path "${drive}:\$p"
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"{0,-28} {1}" -f $p, $(if ($present) {'present'} else {'MISSING'}) | Write-Host
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}
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Write-Host ""
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if (-not (Confirm-Step "Is ${drive}: definitely the Windows install you want to clean?")) {
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Write-Err "Aborted by user. No changes made."; return
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}
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$driversDir = "${drive}:\Windows\System32\drivers"
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$systemHive = "${drive}:\Windows\System32\config\SYSTEM"
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# ---------------------------------------------------------------------------
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# 2. Find Sophos kernel driver files
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# ---------------------------------------------------------------------------
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Write-Head "Step 2 - Sophos driver files on disk"
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$sophosDrivers = @(Get-ChildItem $driversDir -Filter 'Sophos*.sys' -ErrorAction SilentlyContinue)
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if ($sophosDrivers.Count -eq 0) {
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Write-Warn "No Sophos*.sys driver files found (already removed, or different names)."
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} else {
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$sophosDrivers | Select-Object Name, Length, LastWriteTime | Format-Table -AutoSize | Out-String | Write-Host
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}
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# Note: *.man files are ETW manifests, not drivers -- SophosZap removes them. Ignore here.
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# ---------------------------------------------------------------------------
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# 3. Load the offline SYSTEM hive and resolve the active ControlSet
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# ---------------------------------------------------------------------------
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Write-Head "Step 3 - Load the offline registry hive"
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# Clean up a stale mount from a previous aborted run, if any.
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reg unload $HiveMount 2>$null | Out-Null
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$loaded = $false
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try {
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& reg load $HiveMount $systemHive | Out-Null
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if ($LASTEXITCODE -ne 0) { throw "reg load failed (exit $LASTEXITCODE). Is the hive in use / volume locked?" }
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$loaded = $true
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Write-Ok "Loaded $systemHive as $HiveMount"
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# Offline hives have ControlSet001/002 + Select\Current -- NOT CurrentControlSet.
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$controlSet = 'ControlSet001'
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$sel = & reg query "$HiveMount\Select" /v Current 2>$null
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if ($sel -match 'Current\s+REG_DWORD\s+0x([0-9a-fA-F]+)') {
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$controlSet = "ControlSet{0:D3}" -f [Convert]::ToInt32($matches[1], 16)
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}
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Write-Ok "Active control set: $controlSet"
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$svcKey = "$HiveMount\$controlSet\Services\Sophos Endpoint Defense"
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$tpKey = "$svcKey\TamperProtection\Config"
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# -----------------------------------------------------------------------
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# 4. Show current values BEFORE changing anything
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# -----------------------------------------------------------------------
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Write-Head "Step 4 - Current Sophos tamper state (offline hive)"
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$svcExists = $false
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& reg query $svcKey 2>$null | Out-Null
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if ($LASTEXITCODE -eq 0) {
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$svcExists = $true
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Write-Host "Service 'Sophos Endpoint Defense' -> Start:"
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& reg query $svcKey /v Start 2>$null | Where-Object { $_ -match 'Start' } | Write-Host
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Write-Host "TamperProtection flags:"
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& reg query $tpKey /v SEDEnabled 2>$null | Where-Object { $_ -match 'SEDEnabled' } | Write-Host
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& reg query $tpKey /v IgnoreSAV 2>$null | Where-Object { $_ -match 'IgnoreSAV' } | Write-Host
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} else {
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Write-Warn "Service key 'Sophos Endpoint Defense' not found under $controlSet (already removed?)."
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}
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Write-Host ""
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Write-Host "Planned changes:" -ForegroundColor White
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Write-Host " - rename $($sophosDrivers.Count) Sophos*.sys driver file(s) to .old"
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Write-Host " - set service 'Sophos Endpoint Defense' Start = 4 (Disabled)"
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Write-Host " - set SEDEnabled = 0 and IgnoreSAV = 0"
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Write-Host ""
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if (-not (Confirm-Step "Apply these changes to ${drive}: now?")) {
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Write-Err "Aborted by user before changes. Unloading hive, no edits made."
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return
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}
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# -----------------------------------------------------------------------
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# 5. Apply registry edits (hive still loaded)
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# -----------------------------------------------------------------------
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Write-Head "Step 5 - Apply registry edits"
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if ($svcExists) {
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& reg add $svcKey /v Start /t REG_DWORD /d 4 /f | Out-Null
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if ($LASTEXITCODE -eq 0) { Write-Ok "Service Start set to 4 (Disabled)" } else { Write-Err "Failed to set Start" }
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& reg add $tpKey /v SEDEnabled /t REG_DWORD /d 0 /f | Out-Null
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if ($LASTEXITCODE -eq 0) { Write-Ok "SEDEnabled set to 0" } else { Write-Warn "Could not set SEDEnabled (key may not exist on this version)" }
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& reg add $tpKey /v IgnoreSAV /t REG_DWORD /d 0 /f | Out-Null
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if ($LASTEXITCODE -eq 0) { Write-Ok "IgnoreSAV set to 0" } else { Write-Warn "Could not set IgnoreSAV" }
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Write-Host ""
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Write-Host "Read-back after edit:"
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& reg query $svcKey /v Start 2>$null | Where-Object { $_ -match 'Start' } | Write-Host
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& reg query $tpKey /v SEDEnabled 2>$null | Where-Object { $_ -match 'SEDEnabled' } | Write-Host
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} else {
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Write-Warn "No SED service key to edit -- skipping registry changes."
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}
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}
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finally {
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if ($loaded) {
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[gc]::Collect(); Start-Sleep -Milliseconds 300
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& reg unload $HiveMount 2>$null | Out-Null
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if ($LASTEXITCODE -eq 0) { Write-Ok "Unloaded offline hive ($HiveMount)" }
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else { Write-Warn "reg unload reported a non-zero exit -- if it stayed mounted, close regedit/handles and run: reg unload $HiveMount" }
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}
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}
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# ---------------------------------------------------------------------------
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# 6. Rename the driver files (after the hive is unloaded)
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# ---------------------------------------------------------------------------
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Write-Head "Step 6 - Rename Sophos driver files"
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if ($sophosDrivers.Count -gt 0) {
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if (Confirm-Step "Rename $($sophosDrivers.Count) Sophos*.sys file(s) to .old so they cannot load?") {
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foreach ($f in $sophosDrivers) {
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$target = "$($f.FullName).old"
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try {
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if (Test-Path $target) { Remove-Item $target -Force }
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Rename-Item -LiteralPath $f.FullName -NewName "$($f.Name).old" -Force
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Write-Ok "Renamed $($f.Name) -> $($f.Name).old"
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} catch {
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Write-Err "Could not rename $($f.Name): $($_.Exception.Message)"
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}
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}
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} else {
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Write-Warn "Skipped driver rename (service Start=4 alone should still stop it loading)."
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}
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} else {
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Write-Host " (nothing to rename)"
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}
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# ---------------------------------------------------------------------------
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# 7. Next steps
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# ---------------------------------------------------------------------------
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Write-Head "DONE - offline edits complete"
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Write-Host @"
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Next, in NORMAL Windows (not PE):
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1. Remove the PE USB so the box boots to Windows.
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2. Reboot into Windows.
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3. Run: SophosZap.exe --confirm (pass 1)
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4. Reboot when it reports 'reboot and re-execute'.
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5. Run: SophosZap.exe --confirm (pass 2)
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6. Verify clean:
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Get-Service *sophos* -> nothing
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dir C:\Windows\System32\drivers\Sophos* -> nothing (or only *.old)
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'C:\Program Files\Sophos','C:\ProgramData\Sophos' -> gone
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Get-MpComputerStatus -> RealTimeProtectionEnabled = True
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If SophosZap still says 'tamper protection on', the SEDEnabled flag did not
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clear -- re-check HKLM\SYSTEM\CurrentControlSet\services\Sophos Endpoint Defense\
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TamperProtection\Config\SEDEnabled in live Windows and set it to 0.
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"@ -ForegroundColor White
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}
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catch {
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Write-Host ""
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Write-Err "Script stopped on an error:"
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Write-Host " $($_.Exception.Message)" -ForegroundColor Red
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if ($_.InvocationInfo) { Write-Host " at line $($_.InvocationInfo.ScriptLineNumber): $($_.InvocationInfo.Line.Trim())" -ForegroundColor DarkGray }
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# Best-effort: make sure we never leave the offline hive mounted after a crash.
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reg unload $HiveMount 2>$null | Out-Null
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}
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finally {
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Write-Host ""
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[void](Read-Host "Press Enter to close this window")
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}
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