Computer codes are often shared among different groups, so the matching code isn't definitive proof Lazarus was behind the cyberattack.
Two law enforcement officials say USA investigators suspect North Korea may be behind the global "ransomware" attack.
WannaCry also includes software that was stolen from the US National Security Agency [official website] and illegally published online in April. This would help them to plan if their country is attacked.
He found that computer code used in an early version of WannaCry matched code used by the Lazarus group, which has been tied to the North Korean government. Although North Korea denied allegations that it was behind those events, Simon Choi, a senior researcher who has done extensive investigations into North Korea's hacking programs said the WannaCry program is "similar to North Korea's backdoor malicious codes".
An worldwide manhunt was underway as private-sector researchers and government investigators alike tried to stamp out new versions of WannaCry while scouring for clues pointing to the authors of the original virus, who are "potentially criminals or foreign nation-states", said Tom Bossert, President Donald Trump's homeland security adviser. The United States accused it of being behind a cyber attack on Sony Pictures in 2014.
FireEye Inc, another cyber security firm, said it was also investigating, but was cautious about drawing a link to North Korea.
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At the time, the aircraft was off Eleuthera, flying at a speed of 300 knots at an altitude of 24,000 feet, the Coast Guard said. On Tuesday, a C-130 and an MH-60 Jayhawk helicopter searched, the Coast Guard said. "I am sad and in shock", she wrote.
But the paper did not comment whether the North had suffered the attack.
In China, foreign ministry spokeswoman Hua Chunying said she had no information to share, when asked about the origin of the attack and whether North Korea might be connected.
After the series of unprecedented cyber-attacks on more than 400,000 systems and users in as many as 150 countries in the world on May 12, the experts have stepped in to find out the culprits behind this massive scale cyber-attacks occurred in human history.
The council demanded North Korea halt its tests and said it was ready to impose further sanctions.
Specially, no U.S. federal systems are affected, he said.