Delete North Koreans APT/Velvet Chollima directory

North Koreans APT/Velvet Chollima/README.md

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-# Wicked Panda APT Adversary Simulation
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-This is a simulation of attack by the Wicked Panda group (APT-41) targeting U.S. state government networks the attack campaign was active between May 2021 and February 2022, in addition to attacks targeting Taiwanese media, the attack chain starts with the in-memory execution of MoonWalk backdoor. Once the MoonWalk backdoor is successfully loaded by DodgeBox, the malware decrypts and reflectively loads two embedded plugins (C2 and Utility). The C2 plugin uses a custom encrypted C2 protocol to communicate with the attacker-controlled Google Drive account.
-I relied on zscaler to figure out the details to make this simulation: https://www.zscaler.com/blogs/security-research/moonwalk-deep-dive-updated-arsenal-apt41-part-2
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