Moria Orcs

Moria Orcs is the term given to goblins that resided in Moria (Khazad-dum).

Third Age
Moria Orcs (the orcs that dwelt in Moria) were similar to other Orcs of the Misty Mountains. After the Balrog killed King Durin VI, Goblin bands began to raid Moria, pillaging it of its gold, jewels, and Mithril. When Sauron started gathering his forces he sent many Orcs and cave trolls to Moria, where they multiplied. When the Dwarves, led by Balin, returned to Moria, the Goblins attacked and killed them, though many were slain. More were killed when the Fellowship passed through Moria, and still more when they pursued their quarry to Lothlorien and were killed by Elves there. In battle these orcs used swords, bows, and knives. One "huge orc-chieftain, almost man-high, clad in black mail from head to foot," carried a great spear (with which he struck Frodo) and a scimitar.

During the War of the Ring forces from Moria assaulted Lothlorien, but they were driven back.

Fourth Age
During the Fourth Age the Orcs of Moria were driven out when Durin VII and the Dwarves reclaimed Khazad-dum.

Portrayal in Adaptations
In Peter Jackson's movie Moria Orcs are shown scuttling out of cracks in the ceiling like cockroaches.