Following the significant data breach at mobile phone provider Optus, a second Australian company owned by Singapore Telecommunications Ltd. was the target of a cyber attack, worsening the company's data security issue.

According to a Dialog statement provided by SingTel on Monday, a breach on technology firm Dialog, which SingTel purchased earlier this year, may have allowed access to information from less than 20 clients and 1,000 current and former workers. On October 7, Dialog learned that a 'very small sample' of its data, including individual employee data, had been made available on the so-called Dark Web.

The real incident took place on September 10, which was about a month earlier. A second intrusion at a business controlled by SingTel prompts concerns about cybersecurity throughout the entire organisation, the promptness of breach reporting, and whether the Singaporean mother is being purposefully targeted.

Optus, a SingTel affiliate in Australia, disclosed last month that one of the biggest thefts ever in the nation had exposed information on 9.8 million past and present customers as a result of a significant security breach. Identity theft involving more than 2 million people has sparked worries about widespread financial crime. Some of Australia's biggest and most well-known firms are among Dialog's clients, according to the company's website. Along with numerous state and federal government organisations, they comprise National Australia Bank Ltd. and the airline Virgin Australia.

Dialog said in a statement, 'We are doing everything we can to rectify the situation and as a precaution, we are actively engaging with any affected stakeholders to give information, support, and guidance.

The hacks pose a risk of being costly for the Singaporean corporation. The total cost, including bills and fines, may be in the hundreds of millions of dollars, according to some estimates. Optus is already covering the cost of replacement passports and driver's licences.

The second-largest mobile operator in Australia, Optus, experienced a significant cyberattack late last month that exposed the data of potentially 10 million customers. This led to a revision of consumer privacy laws that will make it easier for banks and telecommunications companies to share specific customer information.