ChaosBot Malware: The New Rust Threat That Turns Your Discord into a Remote Control for Your PC

New Rust-based malware abusing Discord RPC to execute commands — analysis + defense.

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Author: CyberDudeBivash — cyberbivash.blogspot.com | Published: Oct 13, 2025

TL;DR

ChaosBot is a new Rust-based malware that misuses Discord’s RPC interface to allow remote execution on victim machines via Discord messages.
This attack vector leverages the common Discord client installation on desktop PCs, making it stealthy and hard to detect unless you monitor inter-process RPC traffic.
This article gives detection strategies, mitigation steps, and incident response guidance—purely defensive and safe to share.

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Contents

Overview: what is ChaosBot?

Researchers have identified a novel malware named **ChaosBot**, written in **Rust**, which hijacks Discord’s **RPC (Remote Procedure Call)** interface to accept commands remotely. Because many users run the Discord client on their PCs, the malware leverages that presence to act stealthily. Early versions are known to target Windows systems, executing arbitrary commands sent over Discord messages via the exploited RPC channel.

Discord RPC abuse explained

Discord RPC interface: used by game overlays, status, and extensions — listens on a local socket or port for commands from local apps.
Malicious commands: ChaosBot opens a listener or piggybacks on Discord’s RPC port to receive payload instructions (e.g. download & execute, shell commands, exfil). The communication appears local, making detection harder.
Persistence & stealth: ensures Discord is running; hides I/O in memory; sometimes injects modules disguised as legitimate plugins.

Attack chain & vector

Initial lure: phishing emails or social media links leading to malicious payloads disguised as game mods or “Discord plugins”.
Drop & execution: payload extracts ChaosBot binary and registers as a service or startup task.
RPC hijack: ChaosBot interfaces with Discord RPC endpoint to listen for incoming command messages (ciphered or encoded) relayed via attacker Discord bot.
Command execution: executes arbitrary commands on victim’s machine (file ops, shell, credential harvest) under context of the user.

Detection & indicators (safe)

Defensive checks to help detect ChaosBot activity:

Unexpected RPC socket binds: processes listening on Discord RPC socket ports (e.g. 6463, 6136) that aren’t Discord.exe or whitelisted extensions.
Discord process message traffic: monitor Discord.exe or related modules issuing new process launches or elevated child execs soon after RPC traffic.
Binary names & paths: unknown .exe or .dll files in Discord plugin directories or “appdata” with random naming.
Outbound C2 after RPC: correlation of RPC triggers followed by HTTP/HTTPS requests outbound to unknown hosts within seconds.

Mitigation & hardening

Restrict RPC access: firewall or OS ACLs to block external access to Discord RPC sockets except trusted modules.
Plugin whitelist: enforce validated plugin signatures or disable third-party plugins entirely unless signed.
Least privilege services: run Discord and related services under limited user accounts; avoid admin rights.
Endpoint protection: block known malicious payloads; use EDR rules on process spawn by Discord or plugin siblings.
Monitor startup items: check for persistence entries pointing to odd executables in user dirs near Discord installation.

Incident response guidance

Isolate host & snapshot: capture memory, disk, and active RPC socket data.
Terminate malicious modules: kill unknown child processes spawned by Discord; unload suspicious DLLs.
Clear persisted components: remove registry autostarts, scheduled tasks, and plugin entries; rebuild Discord installation if needed.
Credential reset & recovery: rotate local and cloud account passwords, especially if cryptocurrency or accounts were exposed.

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Closing thoughts

ChaosBot is a wakeup call: leveraging popular user apps as control channels is a stealthy pivot in malware evolution. Tighten RPC controls, monitor client-side IPC, and validate plugin chains. If you want a tailored review or a desktop-client red team session, reach out: https://www.cyberdudebivash.com/contact

Hashtags:

#CyberDudeBivash #ChaosBot #RustMalware #DiscordRPC #MalwareAnalysis #ThreatHunting #IncidentResponse

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