Several Ukranian banks and companies, including the state power distributor and its largest airport, fell victim to a cyber attack on Tuesday that disrupted some operations.

Some of our gov agencies, private firms were hit by a virus. No need to panic, we're putting utmost efforts to tackle the issue �� pic.twitter.com/RsDnwZD5Oj

— Ukraine / Україна (@Ukraine) June 27, 2017

Ukraine's central bank said an "unknown virus" was to blame for the latest attacks but did not give further details.

"As a result of these cyber attacks these banks are having difficulties with client services and carrying out banking operations," the central bank said in a statement.

"The central bank is confident that the banking infrastructure's defense against cyber fraud is properly set up and attempted cyber attacks on banks' IT systems will be neutralized," it said.

Oschadbank, one of Ukraine's largest state-owned lenders, said some of its services had been affected by a "hacking attack" but promised that customer data was secure.

Ukrainian state power distributor Ukrenergo said its IT system had been compromised by a cyber attack, but the disruption had no impact on power supplies or its broader operations.

What's Hot On TheStreet

Another bank is bullish on Alibaba: JP Morgan initiated Chinese e-commerce giant Alibaba (BABA) with an overweight rating and $190 price target in a new note Tuesday, representing more than 30% growth over Monday's closing price of $142.73. In JP Morgan's eyes, Alibaba is entering a transformation from a pure play e-commerce company to a data-driven beast that stands to power its bottom line more than most expect.

"We believe Alibaba's core commerce is expanding from traffic monetization to data monetization and such trend will quickly expand to its media/cloud businesses," writes JP Morgan analyst Alex Yao. "Such expansion not only allows Alibaba to tap into non-transaction-based corporate budget (e.g. market research, brand awareness, and customer service), but also supports our investment thesis based on sustainable revenue/earnings growth."

A key Walmart business springs back to life: Walmart (WMT) is starting to see long-awaited sales growth at its U.K. Asda division as Britons shift their shopping habits towards food purchases with a slump in consumer confidence and surging inflation, TheStreet's Lisa Botter reports. Sales at Asda rose by 2.2% for the 12-weeks ended June 18, well ahead of the 0.9% pace notched in the 12 weeks to May 21, according to new data from research firm Kantar.

Different strategies emerge in driver-less cars: Alphabet Inc.'s (GOOGL) deal with rental car giant Avis Budget Group Inc. (CAR) to have Avis manage some self-driving test cars developed by Alphabet's Waymo unit and Fiat Chrysler (FCAU) feels a little overblown, writes TheStreet's Eric Jhonsa. The deal only covers test cars deployed in one metro area (Phoenix, Ariz.), and isn't exclusive, Jhonsa points out.

Meanwhile, Apple Inc.'s (AAPL) deal with Avis rival Hertz Global Holdings Inc. (HTZ) feels even smaller. Apple, which has reportedly been testing a half-dozen self-driving cars around the San Francisco Bay Area, is just leasing a small number of Lexus RX450h SUVs from Hertz, with the idea of retrofitting them with self-driving test systems.

Either way, Jhonsa says both deals represent quite the contrast with what Tesla Inc. (TSLA) is trying to pull off. Elon Musk seems to want to go it all alone.

Apple and Alphabet are holdings in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL and GOOGL? Learn more now.

Visit here for the latest business headlines.

More from Investing

Our Columnists Take Your Questions on What Stocks to Buy Here

Our Columnists Take Your Questions on What Stocks to Buy Here

This Will Be the Ultimate Buy (or Sell) Signal for Stocks

This Will Be the Ultimate Buy (or Sell) Signal for Stocks

Jim Cramer: Reports of Attempted Trade Truce With China Are False

Jim Cramer: Reports of Attempted Trade Truce With China Are False

5 Cheap Stocks Primed for a Summer Rally

5 Cheap Stocks Primed for a Summer Rally

3 Killer Stocks Trading at Unfair Discounts

3 Killer Stocks Trading at Unfair Discounts