Threat Intelligence / Actor / CityOfSin

CityOfSin

As of 2026-07-21, CityOfSin is a Russia-nexus threat actor tracked by Threadlinqs Intelligence across 2 threats spanning supply chain. Also known as Backdoor.Win64.Alien operator, UNC-d_coroner (CityOfSin campaign), CityOfSin operator, FileZilla masquerading group.

Nation: Russia · 2 tracked threat(s) · Categories: SUPPLY_CHAIN

Also known as: Backdoor.Win64.Alien operator, UNC-d_coroner (CityOfSin campaign), @d_coroner, CityOfSin operator, FileZilla masquerading group, supp0v3 operator

Tracked threats

CPUID Supply Chain Attack Delivers STX RAT via Trojanized CPU-Z, HWMonitor, and PerfMonitor Downloads — CRITICAL
CPUID Supply Chain Compromise — Trojanized CPU-Z 2.19, HWMonitor 1.63, PerfMonitor 2, and powerMAX Installers Distributed via Compromised cpuid.com API — CRITICAL

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Threadlinqs Intelligence