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Threat Group Cards: A Threat Actor Encyclopedia

Tool: Koredos

Names	Koredos
Category	Malware
Type	DDoS, Wiper
Description	(Symantec) In 2011, organizations in South Korea were yet again targeted by DDoS attacks. Similar to 2009, a number of government and private websites were targeted, this time using a tool called Trojan.Koredos. This attack was unusual for a DDoS attack because it did not use a command and control (C&C) server; the commands were hidden inside the threat itself. The use of a tactic like this indicated a growth in sophistication from the group compared to the 2009 attacks. Symantec research into this threat also found that, as well as carrying out a DDoS attack, if the infected computers were not cleared of this Trojan the master boot record (MBR) of some of them would be destroyed within 10 days.
Information	<https://medium.com/threat-intel/lazarus-attacks-wannacry-5fdeddee476c>

Last change to this tool card: 20 April 2020

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All groups using tool Koredos

Changed	Name	Country	Observed
APT groups
	Lazarus Group, Hidden Cobra, Labyrinth Chollima		2007-May 2025

1 group listed (1 APT, 0 other, 0 unknown)

Digital Service Security Center
Electronic Transactions Development Agency

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