MAR-10265965-3.v1 – North Korean Trojan: CROWDEDFLOUNDER

2020-02-14 USCISA

https://www.us-cert.gov/ncas/analysis-reports/ar20-045c

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CISA, FBI, and DoD analyzed CROWDEDFLOUNDER, a North Korean government-linked Trojan associated with HIDDEN COBRA activity. The malware is a Themida-packed 32-bit Windows executable designed to unpack and execute a remote-access Trojan. Its command-line handling can force the RAT to connect to a specified C2 server, and it uses the CURL library for data transfer. The report notes that C2 traffic is protected with a rotating XOR cipher and provides behavior details intended to support network defense and incident response.

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