Threat Descriptons

IRC backdoor


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Aliases :

IRC backdoor, Backdoor.IRC, Backdoor, IRC


IRC Backdoor (generic description).

An IRC backdoor is usually a standalone file that copies its file to Windows or Windows System folder and creates a Registry key to start that file during every Windows session. Also some IRC backdoors modify WIN.INI and SYSTEM.INI files or copy themselves to startup folders for different users. Some IRC backdoors replace INI scripts of an IRC client (mostly mIRC).


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

When an IRC backdoor is run, it established connection to an IRC server or waits until a user connects to IRC (mIRC script-based backdoor). A backdoor then creates a bot in a specific channel on a specific IRC server. An IRC bot acts as a backdoor server interface. An IRC client in this case acts as a backdoor client. A hacker can give commands to an IRC bot using IRC interface.

Most of advanced IRC backdoors allow to get a limited access to an infected system and to modify, upload, download and run files. Some IRC backdoors have additional functionalities that allow a hacker to perform malicious actions in IRC channels and in some cases can allow an attacker to completely take over an IRC channel.

Most famous IRC backdoors: SDBot, Roron, Nymph.

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