MAR-10271944-1.v1 – North Korean Trojan: HOTCROISSANT

2020-02-14 USCISA

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

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CISA, FBI, and DoD analyzed HOTCROISSANT as a full-featured beaconing implant identified with North Korean government activity tracked as HIDDEN COBRA. The sample attempts to connect to a hardcoded C2 IP, immediately sends victim information, and then waits for operator commands. Its capabilities include system surveys, file upload and download, process and command execution, and screen capture, with communications compressed and encoded using a custom XOR algorithm. The report also documents dynamic API lookup through obfuscated strings, packet/session structure, a decryption script for network traffic, and the sample hash tied to the C2 connection.

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