Cool_Remote_Control

Overview

COOL! Remote Control is an early-generation Remote Access Trojan (RAT) designed to grant unauthorized attackers full administrative access to compromised Windows systems. Operating on a client-server architecture, the malware consists of a server component that secretly runs on the victims machine, listening on a predefined port for incoming connections from the attackers client application. Once a connection is established, the attacker can execute a wide array of malicious actions, including remote file management (uploading, downloading, executing, and deleting files), capturing screenshots, keystroke logging, manipulating system registries, and controlling hardware peripherals such as the mouse and CD-ROM drive. Distributed primarily through social engineering tactics like phishing emails or bundled within pirated software, COOL! Remote Control exemplifies the foundational techniques of remote command and control (C2) that paved the way for modern, highly stealthy RATs. Despite its age, its feature set serves as a blueprint for understanding lateral movement and data exfiltration in early cyber attacks.

Known aliases

Threat reports may refer to this family under multiple names:

• Cool RAT
• CoolRemote

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Legacy_Delphi_Rat_Framework

Known Derivatives & Downstream Variants: Coolremote_V1.12 · Trojan.Coolremote

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1056.001: Implement Endpoint Detection and Response (EDR) to monitor for suspicious API calls related to keystroke interception. Enforce Multi-Factor Authentication (MFA) to render stolen passwords useless.
• T1071: Monitor network traffic for anomalous application layer protocols like non-standard HTTP/S patterns or unexpected DNS requests.
• T1113: Monitor for frequent or unauthorized screen captures or clipboard reads. Restrict background applications from accessing desktop APIs.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2
• c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3

Delivery vectors

• Trojanized administrative utility downloads shared across underground hacking forums
• Phishing attachments disguised as remote desktop utilities

Persistence mechanisms

• HKLM\Software\Microsoft\Windows\CurrentVersion\Run\CoolRemoteServer
• Listening backdoor socket opened on TCP ports 11977, 11978, and 11980

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_COOL_REMOTE_CONTROL_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Cool_Remote_Control"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "cool_remote_control" ascii wide nocase
        $s2 = "cool rat" ascii wide nocase
        $s3 = "coolremote" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Cool_remote_control (Trojan) Execution & Triage
id: 763775c8-4167-5636-b0ad-b5babd90dbdc
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Cool_remote_control malware family. Detects suspicious execution from temporary
  user directories with hidden window flags and background transfer utilities.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/cool_remote_control
- https://malware-families-catalog.systemhelpdesk.com/defensive/downloader-dropper-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.trojan
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1071
- attack.t1056_001
- attack.t1113
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \cscript.exe
    - \wscript.exe
    CommandLine|contains:
    - AppData\Local\Temp
    - -WindowStyle Hidden
    - /e:jscript
    - bitsadmin /transfer
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: medium

rule MALWARE_WIN_COOL_REMOTE_CONTROL_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Cool_Remote_Control tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "cool_remote_control" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Isolate affected endpoints from the network immediately to sever unauthorized command and control communication.
2. Identify and terminate active Cool Remote Control binaries and associated parent-child process chains.
3. Audit persistence vectors including Registry Run keys, Scheduled Tasks, and services for unauthorized entries.
4. Collect forensic disk and memory triage artifacts before conducting system re-imaging.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not attempt manual string or file deletion while network connections remain active; this can trigger secondary dropper routines.
2. Avoid restoring from backups without verifying that the backup snapshot predates initial Cool Remote Control installation.

References & External Analysis

• Trend Micro Threat Encyclopedia - Backdoor.Win32.CoolRemote
• Snort IDS Rule 1-2292 - Cool Remote Control Runtime Detection
• Search "cool_remote_control" on VirusTotal (External Analysis)
• Search "cool_remote_control" on Any.Run (Sandbox Sandbox)
• Search "cool_remote_control" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Dostre
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• Wswhacker
• Jacard
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• 2345Cn

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/cool_remote_control.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.