Symantec says North Korean hacking group Lazarus is responsible for the recent cyberattacks on organizations based in 31 countries, Reuters reports. Symantec says the attackers are now using new sophisticated techniques and this is seen as a "dangerous development."

Lazarus’ involvement was first suspected last month after a string of cyberattacks on Polish banking sector.   

The latest campaign employs a watering hole attack in which loader software installs malicious programs on websites. The malware is programmed to attack only particular IP addresses that belong to residents of 31 countries and from 104 specific organizations. These countries include Poland, US, Mexico, Brazil, and Chile.

Lazarus is suspected in a series of attacks beginning 2009 - including the $81 million Bangladesh Bank cyberheist in 2016 and the attack on Sony Pictures in 2014.

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