diff --git a/tools/test_modules/m09800.pm b/tools/test_modules/m09800.pm
new file mode 100644
index 000000000..a8fb69f49
--- /dev/null
+++ b/tools/test_modules/m09800.pm
@@ -0,0 +1,110 @@
+#!/usr/bin/env perl
+
+##
+## Author......: See docs/credits.txt
+## License.....: MIT
+##
+
+use strict;
+use warnings;
+
+use Crypt::RC4;
+use Digest::SHA qw (sha1);
+use Encode;
+
+sub module_constraints { [[-1, -1], [-1, -1], [0, 15], [32, 32], [-1, -1]] }
+
+sub module_generate_hash
+{
+  my $word   = shift;
+  my $salt   = shift;
+  my $param  = shift;
+  my $param2 = shift;
+
+  my $salt_bin = pack ("H*", $salt);
+
+  my $tmp = sha1 ($salt_bin. encode ("UTF-16LE", $word));
+
+  my $version;
+
+  if (defined $param2)
+  {
+    $version = $param2;
+  }
+  else
+  {
+    $version = (unpack ("L", $tmp) & 1) ? 3 : 4;
+  }
+
+  my $rc4_key = sha1 ($tmp . "\x00\x00\x00\x00");
+
+  if ($version == 3)
+  {
+    $rc4_key = substr ($rc4_key, 0, 5) . "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
+  }
+
+  my $m = Crypt::RC4->new (substr ($rc4_key, 0, 16));
+
+  my $encdata;
+
+  if (defined $param)
+  {
+    $encdata = $m->RC4 (pack ("H*", $param));
+  }
+  else
+  {
+    $encdata = "A" x 16; ## can be anything
+  }
+
+  my $data1_buf = $encdata;
+  my $data2_buf = sha1 (substr ($data1_buf, 0, 16));
+
+  $m = Crypt::RC4->new (substr ($rc4_key, 0, 16));
+
+  my $encrypted1 = $m->RC4 ($data1_buf);
+  my $encrypted2 = $m->RC4 ($data2_buf);
+
+  my $hash = sprintf ("\$oldoffice\$%d*%s*%s*%s", $version, $salt, unpack ("H*", $encrypted1), unpack ("H*", $encrypted2));
+
+  return $hash;
+}
+
+sub module_verify_hash
+{
+  my $line = shift;
+
+  # Office Old $3 $4
+  my ($hash_in, $word) = split ":", $line;
+
+  next unless defined $hash_in;
+  next unless defined $word;
+
+  my @data = split /\*/, $hash_in;
+
+  next unless scalar @data == 4;
+
+  my $signature = shift @data;
+
+  next unless (($signature eq '$oldoffice$3') || ($signature eq '$oldoffice$4'));
+
+  next unless (length $data[0] == 32);
+  next unless (length $data[1] == 32);
+  next unless (length $data[2] == 40);
+
+  my $salt  = shift @data;
+  my $param = shift @data;
+  my $param2 = substr ($signature, 11, 1);
+
+  return unless defined $salt;
+  return unless defined $word;
+  return unless defined $param;
+  return unless defined $param2;
+
+  $word = pack_if_HEX_notation ($word);
+
+  my $new_hash = module_generate_hash ($word, $salt, $param, $param2);
+
+  return ($new_hash, $word);
+}
+
+1;