In a statement, Bursa Malaysia said it is determining the extent of the incident.

“Capital market regulators and the brokers are working closely on the matter,” said Bursa Malaysia.

Earlier, citing a source in the stockbroking industry, The Edge reported that the hacking primarily originated from overseas, as indicated by the internet protocol addresses.

The breach reportedly targeted accounts without pre-approved online trading access, meaning transactions for the accounts would typically require execution through their respective brokerage firms.

A similar but smaller-scale incident occurred about six weeks earlier.

At 5pm, the FTSE Bursa Malaysia KLCI (FBM KLCI) rose 5.33 points, or 0.36%, to 1,506.52 from yesterday’s close of 1,501.19.

The benchmark index opened 0.64 of-a-point lower at 1,500.55 and moved between 1,500.40 and 1,507.45 throughout the day, reported Bernama.