Ciadoor

Overview

Executive Summary

Technical Architecture and Capabilities

• Remote Shell Access: The attacker is granted a remote command-line interface (CLI) to execute arbitrary commands with the privileges of the compromised user.
• File System Manipulation: A covert file manager allows the attacker to browse directories, exfiltrate sensitive intellectual property, and upload secondary payloads.
• System Surveillance: Advanced variants of CiaDoor include modules for real-time keylogging, capturing screenshots, and intercepting clipboard data to steal passwords and sensitive communications.
• Evasion: It frequently utilizes process hollowing to inject its malicious threads into legitimate system processes (like `svchost.exe` or `explorer.exe`) to mask its presence from Task Manager and basic antivirus scanners.

Threat Impact

Detection and Incident Response

• Behavioral Analytics: Deploy EDR platforms tuned to detect anomalous process injection techniques and unexpected child processes (like `cmd.exe`) spawned by standard system binaries.
• Network Traffic Analysis: Monitor edge firewalls for persistent, anomalous outbound connections (beaconing) to unknown IP addresses over non-standard ports.
• System Re-image: Due to the deep system hooks and the potential for secondary backdoor deployment, the most secure remediation strategy for a CiaDoor infection is a complete wipe and re-image of the compromised endpoint from a known good baseline.

Known aliases

Threat reports may refer to this family under multiple names:

• Backdoor.CiaDoor
• RAT.CiaDoor
• Win32/CiaDoor

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:

• T1059: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.
• T1105: Implement network intrusion detection systems (NIDS) and host-based firewalls to block unauthorized inbound or outbound file transfers.

MITRE D3FEND™ Defensive Countermeasures

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

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_CIADOOR_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Ciadoor"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "ciadoor" ascii wide nocase
        $s2 = "backdoor.ciadoor" ascii wide nocase
        $s3 = "rat.ciadoor" ascii wide nocase
        $s4 = "win32/ciadoor" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Ciadoor (Trojan) Execution & Triage
id: 07d5bc73-3bab-5143-93b3-eece4df44377
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Ciadoor 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/ciadoor
- 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.t1059
- attack.t1071_001
- attack.t1055_012
- attack.t1105
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_CIADOOR_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Ciadoor 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 = "ciadoor" 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. Sever network connectivity for the flagged endpoint to terminate persistent command-and-control (C2) communication channels and stop Ciadoor from retrieving secondary stage payloads.
2. Capture process memory triage to detect and terminate malicious threads injected by Ciadoor into legitimate system processes such as explorer.exe or svchost.exe.
3. Audit Windows Registry Run keys (HKCU\Software\Microsoft\Windows\CurrentVersion\Run) and Task Scheduler entries to locate and purge Ciadoor persistence hooks.
4. Deploy updated enterprise EDR detection signatures and conduct an out-of-band endpoint scan to isolate dropped binaries and staged payloads.
5. Rotate all credentials, domain user passwords, and session cookies active on the system during the Ciadoor execution timeframe.

What to Avoid

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

1. Do not assume the incident is resolved simply because an antivirus tool removed the initial Ciadoor dropper; always verify that secondary payloads and persistence hooks have been eradicated.
2. Avoid logging in with Domain Admin or privileged credentials on a machine suspected of running Ciadoor until memory triage is complete.
3. Do not delay host isolation; automated lateral movement and credential dumping can occur within minutes of initial execution.

References & External Analysis

• Search "ciadoor" on VirusTotal (External Analysis)
• Search "ciadoor" on Any.Run (Sandbox Sandbox)
• Search "ciadoor" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Trojan)

Explore other documented threats in the same operational category:

• Carambisdu
• Malex
• Yahoopass
• Socstealer
• Sneepy
• Memery
• Bhoint
• Iezones

Machine-readable

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