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　　South Korea said North Koreas cyber army consisted of 6,800 hackers in 2015. "With North Korea, it appears to be the case that they rely very heavily on this kind of criminal element-amateurs-professionals. 19, 2014, just one month after a devastating hack hobbled Sony Pictures Entertainment, the FBIs field office in San Diego issued a press release stating North Korea was the culprit and saying such cyberattacks pose ``one of the gravest national security dangers to the United States.It named the group Lazarus. "When the stakes are so high, we owe it more diligence than what we have seen so far."The group rapidly develops, mutates and evolves malware through the extensive use of a `malware factory, said James Scott, a senior fellow at the Institute for Critical Infrastructure Technology, a Washington-based think tank. A known group might claim responsibility.But independent experts tend not to take such claims too literally."There is no conclusive evidence that Lazarus is state-sponsored, Scott said, adding that China Wholesale party cooler it has instead always exhibited the characteristics of a well-resourced and organized cybercriminal or cyber-mercenary collective.So who, then, are they?Pinning a cybercrime to a cybercriminal is a Sisyphean task. Its findings lined up with the FBIs conclusion that the tactics, tools and capabilities strongly indicated the work of a "structured, resourced and motivated organization, but said its analysis could not support the direct attribution of a nation-state.

　　Jon Condra, director of Asia-Pacific research at the cybersecurity firm Flashpoint, cautiously noted the theory that at least some Lazarus Group hackers are likely working out of China and that they may include North Koreans. For many, it seems that last question has already been solved: It was North Korea.Scott and Condra caution that much of what is reported about North Koreas cyber army comes from defectors or rival govements with a spin motive and is amplified by partisan or attention-seeking media. military facilities; and "DarkSeoul, an attack on South Korean broadcasting companies and banks. and South Korean websites. It found Lazarus is both accelerating its activities and morphing rapidly.Its claim that North Korea was to blame has since been widely disputed. Its methods and tools may reveal a patte.Their fingerprints are all over WannaCry.Cybercrime would also seem to be extremely attractive to North Korea."The destructive nature of this attack, coupled with its coercive nature, sets it apart, the statement said.Even that, he added, is speculative: "We really do not have a clear picture of the composition of the Lazarus Group."We know North Korea possesses the capability of doing this kind of thing but we are still assessing what the source is, National Intelligence Director Dan Coats told a congressional hearing last week.

　　The FBI listed similarities in specific lines of code, encryption algorithms, data deletion methods and compromised networks for its determination.Its hard to trace, can be done on the cheap and, for those who can master the technological expertise, the opportunities seem to be everywhere. Defectors insights are valuable, yes. It might use a traceable inteet protocol address, or a unique code.Instead, it determined the attack "was carried out by a single group, or potentially very closely linked groups, sharing technical resources, infrastructure and even tasking.The US govement has not blamed WannaCry on North Korea. It said there was a significant overlap between the infrastructure used in the attack and other cyberactivity it had previously linked directly to North Korea, including several inteet protocol addresses hardcoded into the data deletion malware."It is widely believed that at least some North Korean hacking units operate out of Northeaste China - the city of Shenyang, in particular - but hard evidence is scant, he said."This is a determined adversary with the resources to develop unique, mission-oriented malware tools, the 100-page report concluded.Washington, Seoul and defectors from North Korea all claim the North is working hard to train an army of cyber warriors, mainly within its primary intelligence agency, the Reconnaissance General Bureau.