In a private letter to clients, SWIFT was quoted by Reuters as saying that new cyber-theft attempts some successful have surfaced since June.
Customers environments have been compromised, and subsequent attempts were made to send fraudulent payment instructions, according to a copy of the letter reviewed by Reuters.
The global financial messaging system has reportedly warned its member banks of ongoing hacking attacks in recent months and told partners it expects them to deliver an operational baseline of appropriate security measures.
SWIFT joined forces with BAE Systems in July to bolster its cyber security expertise.
But it seems at though SWIFT has detected a spike in attacks against the network since the online thieves came close to stealing nearly a billion dollars from the account belonging to the Central Bank of Bangladesh earlier this year.
Those attackers managed to exploit weak local security procedures to pocket at least $81 million £57m from its account located at the Federal Reserve Bank of New York.