It seems that nearly 1K stores have been breached on July 4, 2019. They sending now card data to highjacked sites.
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962 stores found breached on 4 July – Magecart are at it again and this time it looks automated. See what @gwillem and chums found https://t.co/2hTcjvfNzB
— Alan Woodward (@ProfWoodward) 5. Juli 2019