Skip to main content
Skip to main content
Microsoft Security Intelligence
Cart 0 items in shopping cart
Sign in
Published Feb 28, 2010 | Updated Sep 15, 2017

Backdoor:Win32/IRCbot.DY

Detected by Microsoft Defender Antivirus

Aliases: W32/IRCbot.worm (McAfee) TROJ_DROPPER.OUV (Trend Micro) Trojan-Dropper.Win32.Agent.bbbt (Kaspersky) W32/Sdbot-DPE (Sophos) W32.Spybot.Worm (Symantec)

Summary

Backdoor:Win32/IRCbot.DY is a member of Win32/IRCbot - a broad family of backdoor trojans that allows unauthorized access and control of an affected machine by a remote attacker via IRC.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as the Microsoft Safety Scanner (http://go.microsoft.com/fwlink/?LinkId=212742). For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.

Additional remediation instructions

This threat may make lasting changes to an affected system's configuration that will NOT be restored by detecting and removing this threat. For more information on returning an affected system to its pre-infected state, please see the following information:
Disable Autorun functionality
Backdoor:Win32/IRCbot.DY attempts to spread via removable drives on computers that support Autorun functionality. This is a particularly common method of spreading for many current malware families. For information on disabling Autorun functionality, please see the following article: http://support.microsoft.com/kb/967715/
To recreate a clean HOSTS file:
  1. Click Start, and click Run.
  2. Open the Hosts file, according to operating system:

    On Windows 95, Windows 98, or Windows ME systems:
    In the Open field, type: notepad %windir%\hosts

    On Windows NT-based operating systems, such as Windows 2000 or Windows XP:
    In the Open field, type: notepad <system folder>\drivers\etc\hosts
    -- for example, on Windows 2000:
    In the Open field, type: notepad C:\WINNT\system32\drivers\etc\hosts
    -- or on Windows XP:
    In the Open field, type: notepad C:\Windows\system32\drivers\etc\hosts

    On Windows Vista:
    Click Start, click All Programs, click Accessories, right-click Notepad, and then click Run as administrator
    Click File, click Open, type: %windir%\system32\drivers\etc\hosts, and then click Open
  3. On the first line of the HOSTS file, type: 127.0.0.1 localhost.
  4. Save the file to the same location you opened it from.
  5. Close Notepad.
Follow us