Backdoor:Win32/Ircbot is a generic classification for a vast family of backdoor trojans that utilize Internet Relay Chat (IRC) channels for Command and Control (C2) communication.
What is Ircbot?
To the average user, an Ircbot infection might manifest as sudden spikes in network usage or unexplained sluggishness. For cybersecurity experts and threat hunters, Ircbot represents a classic botnet architecture. Once an endpoint is compromised, the malware silently connects to a predefined IRC server and joins a hidden channel, waiting for commands broadcasted by the botmaster.
Infection Vectors & Threat Hunting
Ircbot variants are typically delivered via malicious email attachments, drive-by downloads, or dropped by primary initial access brokers. Upon execution, the malware establishes persistence by copying itself into the Windows system folder and modifying the HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run registry key. Threat hunters should actively monitor network traffic for anomalous outbound connections on standard IRC ports (6667, 6668) or unexpected HTTP traffic mimicking IRC protocols.
Forensic Analysis & Impact
From an incident response perspective, the impact of an Ircbot infection is severe. The botmaster can command the infected host to participate in Distributed Denial of Service (DDoS) attacks, download and execute secondary payloads (such as ransomware or infostealers), or exfiltrate sensitive local data. Forensic analysts should look for dropped executable files in the %SystemRoot% directory and analyze network captures (PCAPs) to extract the C2 server addresses and IRC channel passwords.
Observed techniques used by this family, mapped to the MITRE ATT&CK framework:
| Technique | Name | Tactic |
|---|---|---|
T1071.002 | Application Layer Protocol: File Transfer Protocols | Command and Control |
T1547.001 | Boot or Logon Autostart Execution: Registry Run Keys / Startup Folder | Persistence |
T1105 | Ingress Tool Transfer | Command and Control |
T1498 | Network Denial of Service | Impact |
T1059.003 | Command and Scripting Interpreter: Windows Command Shell | Execution |
These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.
rule MALWARE_WIN_IRCBOT {
meta:
description = "Detects Ircbot (rat)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "ircbot" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}title: Suspicious Ircbot Activity
id: ce62e87412a9e33a5ae95e7ff7a0f0d6
status: experimental
description: Detects generic indicators of the ircbot malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*ircbot*"
condition: selection
level: mediumOrdered checklist for responders. Adapt to your environment and engage professional support for active incidents.
Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.
Explore other malware families in the same category:
Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/ircbot.json
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, Replit, StackBlitz, CodeSandbox, and CodePen.