Attacks from the online groups Lazarus, Silent Chollima, Group 123, Hidden Cobra, DarkSeoul, Blockbuster, Operation Troy, and 10 Days of Rain are believed to have come from North Korea. But how can we know with certainty? And what connection does a DDoS and disk-wiping attack from July 4, 2009, have with WannaCry, one of the largest cyberattacks in the history of the cyber sphere?
From the Mydoom variant Brambul to the more recent Fallchill, WannaCry, and the targeting of cryptocurrency exchanges, we see a distinct timeline of attacks beginning from the moment North Korea entered the world stage as a significant threat actor.
Bad actors have a tendency to unwittingly leave fingerprints on their attacks, allowing researchers to connect the dots between them. North Korean actors have left many of these clues in their wake and throughout the evolution of their malware arsenal.
This post reflects months of research; in it we will highlight our code analysis illustrating key similarities between samples attributed to the Democratic People’s Republic of Korea, a shared networking infrastructure, and other revealing data hidden within the binaries. Together these puzzle pieces show the connections between the many attacks attributed to North Korea and categorize different tools used by specific teams of their cyber army.
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