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Are the 2011 and 2013 South Korean Cyberattacks Related?

2013-03-29, Symantec
https://community.broadcom.com/symantecenterprise/communities/community-home/librarydocuments/viewdocument?DocumentKey=e1dad271-3caf-48ac-a133-b21bc909398c&CommunityKey=1ecf5f55-9545-44d6-b0f4-4e4a7f5f5e68&tab=librarydocuments
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Contents

Overview
In the past four years there have been several major cyberattacks against South Korea. We have identified a particular back door (Backdoor.Prioxer) that surfaced during the 2011 attacks. A modified version of this back door was also discovered during the 2013 attacks. The back door is based on publicly available code, but there are some indications that the same individuals are responsible for the 2011 and 2013 versions, pointing towards a possible connection between the two attacks.
Background
The first documented major attack was in July, 2009. The attacks began on July 4, Independence Day in the United States, and consisted of a distributed denial-of-service (DDoS) attack against various Korean and US government and financial websites. A second wave of attacks occurred on July 7 and a third wave on July 9. The malware used to launch the attacks was Trojan.Dozer, which was spread through e-mail. Trojan.Dozer contained a time bomb in …