[Tsundere Botnet](https://attack.mitre.org/software/S9034) is a botnet first reported in mid-2025 that is delivered via MSI installer or a PowerShell script. It leverages Node.js and JavaScript for payload delivery and execution, and uses smart contracts on the blockchain to host command and control (C2) addresses. [Tsundere Botnet](https://attack.mitre.org/software/S9034) is attributed to a likely Russian-speaking threat actor. A variant named DinDoor has been linked to [MuddyWater](https://attack.mitre.org/groups/G0069) operations and uses the Deno runtime for execution rather than Node.js.(Citation: Checkpoint_MOISCyberCrime_Mar2026)(Citation: SOCRadar_MuddyWaterDindoor_Mar2026)(Citation: CAL_MuddyWater_Mar2026)(Citation: SecureListUbiedo_Tsundere_Nov2025)