We don't know which specific factories were hit with the viruses and shut down, and whether they were factories that are important to NVIDIA and its next-gen GeForce GTX 1180 and other graphics cards expected to be released imminently, or Apple's upcoming next-gen iPhone. "TSMC has taken actions to close this security gap and further strengthen security measures", it said.
Although it remained unclear who targeted TMSC, the company which not only supplies processors to Apple but also to Qualcomm, the report stated that the virus was not introduced by a hacker. TSMC has said that the virus affected several of its fabrication tools though the problem has been contained.
TSMC is working on solutions now but said the degree of infection varied from factory to factory, and that it would provide more information on Monday after it has assessed the situation.More news: County Preparing for Hurricane Hector
The company expects full recovery on August 6, the company said in an updated statement on Sunday.
The company says the incident will cut third-quarter revenue by about 3 per cent.
"TSMC expects this incident to cause shipment delays and additional costs". We estimate the impact to third-quarter revenue to be about three percent, and impact to gross margin to be about one percentage point.More news: Portland rallies to get bomb-sniffing dogs, weapons checkpoints
TSMC previously said about 10% of its revenues would be generated from its most-advanced 7nm process technology in the third quarter of 2018, and the proportion would reach 20% in the fourth quarter, with an over 20% in all of 2018.
TSMC's chief financial officer Lora Ho told Bloomberg that the chipmaker has been attacked by viruses in the past, but never has malware affected the company's production lines.
Regardless of the details behind the attack, it clearly comes at a bad time for TSMC. The iPhone maker last week surpassed a market value of $1 trillion, largely on the strength of sales for its pioneering smartphone.More news: Khloe Kardashian says motherhood has changed how she looks at fashion
TSMC has grown to become the largest independent semiconductor foundry in the world, with profits past year of $11.6 billion.