Sophos

Troj/Flood-EK

Aliases
  • BKDR_IRCFLOOD.EM
  • IRC/Flood.bk
Category
Type
What to do
Prevalence low high

Summary

 
Affected operating systems Windows
Characteristics
  • Drops more malware
Included in our products from August 2005 (3.96)
Protection available since 23 January 2005 15:59:02 (GMT)
Last updated 4 July 2005 09:52:08 (GMT)
Detected by All Sophos products

Action

Please follow the instructions for removing Trojans.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
taskmngr
<path to msnve.exe> <path to task.exe>

and delete it if it exists.

Close the registry editor.

More Information

Troj/Flood-EK is a Trojan which attempts to flood IRC channels.

Troj/Flood-EK creates a new folder within the Program files\Common files folder called "updates" with the following subfolders:

dat, log, plugin, preset, setup

Within the newly created folder Troj/Flood-EK drops several files, most of which are legitimate applications (eg PsKill and hiddenrun) or innocuous text files (eg config.in and language.in).

The Trojan drops and executes a file called task.exe. Task.exe is a legitimate chat application (mIRC v6.03) but is used by the Trojan along with certain INI files (eg mscn.dll) to attempt the flooding functionality.

Troj/Flood-EK also drops the BAT files task.bat which uses a legitimate utility called reg.exe to create a registry entry at the following location to run task.exe on logon or system restart using another legitimate utility called msnve.exe:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
taskmngr
<path to msnve.exe> <path to task.exe>

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