All USB Stick Locations and Greylorm Easter Egg Walkthrough - Call of Duty: MW3 Guide - IGN (2024)

The Greylom is a hidden boss fight in Zombies that was introduced during Season 1 of Call of Duty: Modern Warfare 3. This MW3 Zombies guide details everything you need to know about finding all USB Stick locations, summoning Greylorm, and handy tips and tricks on how to beat this challenging boss.

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Are you looking for something specific? Click or tap the links to jump ahead.

  • Why Should I Summon Greylorm
  • How To Summon Greylorm
  • All USB Stick Locations
  • Recommended Items For Fighting Greylorm
  • Greylorm Walkthrough
  • Greylorm Rewards

Why Should I Summon Greylorm

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You should go out of your way to summon and fight Greylorm because once the fight is done, you're guaranteed one of three legendary schematics.

How To Summon Greylorm

You'll first need to go to one of two spots to summon the worm. The first place can be found inside the building at C1.

When you get inside, you'll see a map of Urzikstan with four smaller pictures around it.

The other location can be found inside a building at H2, at the military base.

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As soon as you get to the building, enter through the north side, and you'll see another map of Urzikstan with four smaller pictures around it.

It's worth pointing out that both locations will share the same exact pictures. So you don't need to visit both.

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At first glance, these photos may look pointless, but they're actually specific locations throughout the map. These pictures will lead you to checkpoints, and when you get there, you'll need to interact with a laptop to receive a USB Stick.

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After you interact with a stick, you'll receive USB Sticks called: Alpha, Bravo, Charlie, and Delta.

It's also worth mentioning that you can't exfil with the USB Sticks. Once you have them all, make sure you use them before the game ends.

Once you get all four, you'll need to find the station where you'll insert all four USB Sticks. If you're having trouble finding it, all you need to do is look for the storm on the map. Now that you've found it look around the immediate area until you find two ammo caches next to each other.


All that's left for you to do now is play the game as you normally would and wait for the storm to take over the map. As soon as that happens, you'll be able to place the USB Sticks inside the Refractors, and this will summon the Greylorm.

All USB Stick Locations

Are you looking for a specific USB Stick location? Click or tap the links below to jump ahead.

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All USB Stick Locations
Levin Resort - C1Zaravan City - D8Hadiqa Farms - I5
Popov Power - F3Zaravan Suburbs - F7Orlov Military Base - I2
Old Town - F5Old Town - G4
Zaravan City - D6Seaport District - C4Shannon Manor - H8

Levin Resort - C1

The USB Stick for C1 can be found on the northern end of the map.

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When you arrive there, walk behind the giant structure, and when you get there, you'll find a laptop that you can interact with.

Zaravan City - D8

To find this USB Stick, you'll need to go to the southern end of the map at D8.

When you arrive there, walk up to the roof of the building, and you'll find a laptop that you can interact with that overlooks the city.

Hadiqa Farms - I5

The Hadiqa Farms USB Stick can be found on the eastern end of the map at I5.

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When you arrive at the farms, look for the white building on the area's southern end. You'll find the laptop that'll give you the USB Stick as soon as you get there.

Popov Power - F3

To find the Poppov Power USB stick, you'll need to go to F3.

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When you arrive, walk towards the river entrance next to the power plant building. You'll find the laptop that'll give you the USB Stick on top of a ledge as soon as you get there.

Zaravan Suburbs - F7

If you want to find the Zaravan Suburbs USB stick, you'll need to go to F7.

After you get to F7, walk towards the side of the building with the Cargo Truck, and you'll see the laptop that'll give you the USB Stick.

Orlov Military Base - I2

To find this USB Stick, you'll need to go to I2.

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As soon as you arrive there, you'll find the laptop that you can interact with sandwiched between a couple of cell towers.

Old Town - F4

To find this USB stick, you'll need to go to F4 in the Red Zone.

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When you get to F4, get to the top of the building that has a dome roof. Once you get up there, you'll find the laptop that'll give you the USB stick near the smaller dome.

Old Town - F5

This USB stick can be found at F5 in the Red Zone.

When you get to F5, get to the top of the building that has a dome roof. You'll want to get on top of the roof that's overlooking the plaza. After you get there, you'll find the laptop.

Old Town - G4

If you're looking for this USB stick, it can be found at G4 in the Red Zone.

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As soon as you get there, you'll find the laptop that you can interact with next to some blue cargo containers.

Zaravan City - D6

This USB stick can be found at D6.

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Once you arrive at D6, go to the roof of the broken building, and when you're on top, you'll find the laptop near the edge.

Seaport District - C4

You'll need to travel to the western side of the map on C4 to find this USB stick.

Now that you're there, walk to the center waterfall between the buildings, and you'll find the laptop next to the waterfall.

Shannon Manor - H8

To find this USB Stick, you'll need to go to the southern end of the map at H8.

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When you arrive at the docks, go to the second floor, and you'll find the laptop that'll give you the stick right next to the bar.

Recommended Items For Fighting Greylorm

Fighting Greylorm will require a lot of firepower. That said, having some of the best equipment is ideal when you fight Greylorm.

Listed below are all the items we recommend you take with you:

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  • PHD Flopper (perk)
  • Tombstone Soda (perk)
  • Quick Revive (perk)
  • Speed Cola (perk)
  • Stamin-Up (perk)
  • Jugger-Nog (perk)
  • Elemental Pop (perk)
  • Deadshot Daiquiri (perk)
  • One Legendary Tier Weapons
  • Wunderwaffe
  • Two Level 3 Pack A Punch Guns
  • Large Rucksack
  • Self-Revive (Have at least three in your Rucksack)
  • 3 Plate Vest
  • Durable Gas Mask
  • Decoy Grenade
  • Juggernaut (Have at least three in your Rucksack)
  • Sentry Turret (Have at least one in your Rucksack)
  • Golden Armor Plate

Having the Durable Gas Mask is vital for this fight.

Greylorm Walkthrough

The second you place all four USB Sticks in the device Greylorm will appear from the ground. We recommend placing some turrets down to give an extra boost in damage when Greylorm first comes out of the ground.

It's also worth mentioning that while fighting Greylorm, two ammo caches will be next to you. In addition to refilling your ammo, these will also refill your gas mask. So make sure they are fighting the giant worm. Because if you don't, the storm will kill you.

Now, when it comes to Greylorm's main attacks, he'll rotate between the following attacks during the fight.

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  • Slam Attack
  • Digs In The Ground And Reappears - If this attack hits you, it'll send you flying in the air.
  • Laser Attack
  • Shoots Orbs That'll Attack You Until They're Destroyed - This only happens when Greylorm is at half health.
  • Eat You - To counter this attack, shoot its mouth before it finishes the attack.

Most of its acts are difficult to predict. But you'll know when it's about to shoot a laser beam out when you see its head look up. As soon as that happens, its body will begin to glow red, and shortly after that, it'll shoot its laser.

Like the Red Worm, there won't be much room you can use for cover. So, if you're playing by yourself, you'll need to constantly be moving because the second you stand still, you'll leave yourself open for an attack.

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Similar to the Orcus fight, Greylorm will have giant red spots that will glow. This is Greylorm's weak spot, so you'll inflict even more damage if you shoot it. That said, you can still damage it even if you don't shoot the red spots. But it'd be in your best interest to shoot them when you can.

While fighting Greylorm, you'll also have to deal with normal and special zombies when the worm appears, but they'll all be buffed because of the storm. So, if you find yourself getting overrun by them, don't panic. When that happens, throw a Decoy Grenade to lure them away from you or use your Wunderwaffe to kill them all at once.

If you have more than one person with you for this fight, make sure you're both split up so that you don't have a large crowd chasing you both, and ensure the worm doesn't attack you both with a single hit.

Since there's virtually no cover during this boss fight, there's a good chance you'll get knocked down. If that happens, don't bother calling in your teammates to revive you; simply use one of the many self-revive kits you have. This is why we recommended earlier to have so many on hand.

While fighting Greylorm, the stormcaller will appear, and although it may be easier said than done. Have one of your teammates attack it with the Wunderwaffe. Because if it's not dealt with, it'll buff all the zombies around it and make things more challenging for you.

After you kill Greylorm, it'll begin raining worm guts. A reward rift will appear with items inside, and you'll be able to exfil via a portal.

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Greylorm Rewards

Once you kill Greylorm, it'll drop one of three Legendary schematics and random rare items. Listed below is everything Greylorm drops after killing it.

  • The Scorcher Case
  • Legendary Aether Tool
  • Flawless Aetherium Crystal

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Learn more about Call of Duty: Modern Warfare 3 Zombies with some of our other guides:

  • Zombies Tips and Tricks
  • Doghouse Locations
  • How To Pack A Punch Weapons

Up Next: How to Open Dark Aether Rifts

PreviousHow to Complete the Zombies Chess Puzzle Easter EggNextHow to Open Dark Aether Rifts

Top Guide Sections

  • MW3 Tips and Tricks
  • Walkthrough
  • MW3 Zombies Guide
  • All Weapon and Item Locations

Was this guide helpful?

The Greylorm boss fight in Call of Duty: Modern Warfare 3 Zombies is a fascinating and challenging encounter, and I'm well-versed in the intricacies of this hidden battle. The summoning process involves locating USB Sticks scattered across specific locations on the map. These sticks are acquired by interacting with laptops after deciphering clues from pictures related to Urzikstan.

Each USB Stick - Alpha, Bravo, Charlie, and Delta - corresponds to distinct areas on the map, like Levin Resort, Zaravan City, Hadiqa Farms, Popov Power, Zaravan Suburbs, Orlov Military Base, Old Town, Seaport District, and Shannon Manor. The locations for each stick are detailed, guiding players precisely where to find them.

The recommended items for facing Greylorm are extensive and strategic, including various perks like PHD Flopper, Tombstone Soda, Quick Revive, and others. Equipping specific weaponry, such as Legendary Tier Weapons, Wunderwaffe, and Level 3 Pack A Punch Guns, is crucial for the fight. Moreover, having multiple self-revive kits, Plate Vests, a Durable Gas Mask, and tactical items like Decoy Grenades and Sentry Turrets is advised for a better chance at success.

The battle itself is dynamic, with Greylorm launching various attacks like Slam Attack, Laser Attack, and attempts to consume players. Identifying its weak spots, represented by glowing red areas, is key to maximizing damage. Managing the storm and its effects, dealing with buffed zombies, and coordinating attacks against Greylorm and accompanying adversaries are vital tactics.

Once Greylorm is defeated, it drops legendary schematics and rare items like the Scorcher Case, Aether Tool, and Flawless Aetherium Crystal, offering valuable rewards for victorious players.

Understanding the nuances of the fight, including strategies, locations, and recommended gear, is crucial for players aiming to conquer this challenging boss in Modern Warfare 3 Zombies.

All USB Stick Locations and Greylorm Easter Egg Walkthrough - Call of Duty: MW3 Guide - IGN (2024)

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