Well, I've finally found the solution by myself

use Win32::OLE;
$Win32::OLE::Warn = 3; # see perldoc Win32::OLE

my $userDn   = 'cn=myself,ou=myOu,dc=myDomain,dc=myTld';
my $password = 'secret';
my @wantedFields = qw(ADsPath cn sn givenName sAMAccountName);
my $searchFilter = "(&(objectClass=user)(sn=*))";

# connect to AD with user and password
my $connObj = Win32::OLE->new('ADODB.Connection');
$connObj->{Provider}               = 'ADsDSOObject';
$connObj->Properties->{'User ID' } = $userDn;
$connObj->Properties->{'Password'} = $password;
$connObj->Open('ADSI Provider');

# prepare a search
my $searchString =
  join (";", "<LDAP://192.1.2.3/dc=myDomain,dc=myTld>",
             $searchFilter,
             join(",", @wantedFields),
             'SubTree',
        );
my $adoCmdObj = Win32::OLE->new('ADODB.Command');
$adoCmdObj->{ActiveConnection}        = $connObj;
$adoCmdObj->{CommandText}             = $searchString;
$adoCmdObj->Properties->{'Page Size'} = 1000;

# execute search and return user one by onesy
my $rsObj = Win32::OLE->new('ADODB.RecordSet');
$rsObj->Open( { Source => $adoCmdObj } );

$rsObj->MoveFirst() if $rsObj and not $rs->EOF();

while (not $rsObj->EOF) {
  foreach my $i (0..$#wantedFields) {
    my $value = $rsObj->Fields($i)->{Value};

    # $values may be a lot of different things that often      
    # can't just be printed (e.g. octet string, multivalues)
    # Win32::OLE::Variant objects, ...
    # if you work with them, the following line doesn't make
    # much sense but has to be replaced
    printf "%s: %s\n", $wantedFields[$i], $value; 

  } # foreach
  print "--------------\n";

  # move "cursor" to next obj to prevent infinite loop
  $rsObj->MoveNext(); 
} # while

$rsObj->Close();

$connObj->Close();
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