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Severity
High
Analysis Summary
Kimsuky is a North Korean nation-state actor that has been active since 2012. It primarily targets South Korean government agencies and conducts espionage activities against targets in the United States and Japan. Kimsuky has dropped a custom backdoor which they are calling Gold Dragon. Kimsuky deploys Gold Dragon, a second-stage backdoor, after a file-less PowerShell-deploying first-stage attack is dropped.
This group has the ability to put up phishing infrastructure that can effectively imitate well-known websites and fool users into entering their passwords. Kimsuky APT is also known by the names Thallium, Black Banshee, and Velvet Chollima. KISA (Korean Internet & Security Agency) published a full investigation of Kimsuky’s phishing infrastructure and TTPs used to attack South Korea in December 2020. To get Initial Access to victim networks, Kimsuky’s threat actors use a variety of spear phishing and social engineering techniques. This group is responsible for the 2014 Korea Hydro & Nuclear Power Co. compromise, and other major campaigns like Operation Kabar Cobra(2019).
Impact
- Information theft and espionage
- Exposure of sensitive data
Indicators of Compromise
Filename
- contract[.]chm
- wages[.]chm
- Nodejs for Game Server Development[.]chm
- User Guide[.]chm
MD5
- 997165ed836b8a2a6af5cf2d43af5803
- 5f1091df4c74412ef59426c1bb65f4d0
- ae43f4d4c6123294b2f3ede294032944
- acc6263bd54de778c1e22373d73887ab
SHA-256
- 3f2c43b3d4a00d20dfbc0d29b5e2348028e95be6cc0bef1e7f6823cdd6667280
- a72a9ce14d2f914a86aeaf7d963164413be158dfdd339182146a522eceb4552e
- 7f14b789453a0e94b5afa63f8e5319e80cef78d81d60471caa0805ddfe01c6a6
- e62a7d9184a841e2b53e41f2d85aa278b427e2e427dbfd8f4be072108e3089c1
SHA-1
- 08502f51d1913a9ea56898d29be52916d4b6ec7c
- 97f41634e2be787c822bc19da100ed7698b5dc88
- 88305a923c85cd33ca5b052305de1cea9a39fcd0
- bf7922ef1627ce916683f84f741c84b9935eebf4
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.
- Always be suspicious about emails sent by unknown senders.