How they found their way into Moria is unclear, but the forces of the White Hand are now entrenched in the Orc communities of Khazad-dûm. However, it appears to Thithrand that they wish to claim leadership over Moria for themselves.
'Reports from all throughout Khazad-dûm say that the Orcs of the White Hand have no intention to kneel to Mazog, but still they come to the Grand Stair, offering their tribute to Igash. Still they stand among the Orcs within Khazad-dûm.
'When you breach the Grand Stair, north-east from the Orc-watch, seek to defeat the White Hand Orcs where they stand. There are many of these foes to be found within. The lesser, simpler beings are akin to their masters in many ways.
'Be cautious and decisive in your assault, ${PLAYER}.'
White Hand Orcs can be found in the Grand Stair, north-east of the Orc-watch.
Thithrand mentioned that the White Hand Orcs found in the Grand Stair are lesser images of their leaders, and that there is a good number of the foe within. You should use caution when you face them.
Thithrand is at the Orc-watch, south-west of the Grand Stair.
You should return to Thithrand with news of your successes.