A ransomware attack that struck government and businesses in the Ukraine and Europe Tuesday has affected Merck (MRK) - Get Report and is spreading in the United States, according to a published report.

The virus, which is being called Petya, is similar to the WannaCry exploit that spread quickly last month, the New York Times reported. The malware uses the same hacking tool believed to have been used in that attack and developed by the National Security Agency, the paper reported.

Here are some of the attack victims, as compiled by TheStreet:

WPP plc (WPPGY) -- Most of WPP's public websites were rendered inaccessible after the world's biggest advertising group said its IT systems were the focus of a suspected cyberattack. Shares traded down almost 1% in early afternoon.

AP Moeller-Maersk AS (AMKBY) -- The world's biggest container shipping firm's IT department was also hit, leading to system shutdowns across the Danish company.

TNT Express -- The dutch-based and FedEx (FDX) - Get Report owned shipping company had systematic interference as an attack target.

Mondelez (MDLZ) - Get Report -- The food group said its employees were experiencing technical problems in several regions, but haven't yet confirmed whether it was part of today's widespread cyberattack. Shares traded down over 1% in early afternoon.

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Rosneft -- Russia's biggest oil company said crude production wasn't affected even though it was hit by the attack because the company switched to a reserve control system, it wrote on Twitter (TWTR) - Get Report .

Evraz -- The Russian steelmaker's IT department was hit, but there was no impact on production sites or employee safety, a spokeswoman told Reuters.

Ukrenergo -- Ukraine's state power distributor's IT system was compromised, but it didn't affect the power supply or operations.

National Bank of Ukraine -- The central bank said an unknown virus restricted everyday functionality for customers. It urged customers to allow specialists to do their job, but advised them not to open e-mails from unknown senders.

Antonov -- The Ukrainian state-backed aircraft manufacturer was also hit. A spokeswoman said it is unclear how serious the attack is, according to Reuters.

Oschadbank -- One of Ukraine's largest state-owned lenders said a "hacking attack" affected services, but no customer data was compromised.

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