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Worm Acts with mIRC to Allow Remote Access
One of Several New Worms to Emerge This Week
Esther Shein

RC/Krisworm-C is a worm used in conjunction with mIRC to allow remote access to the host computer, according to Sophos, which issued an alert Monday.

It has the same characteristics as W32/Krisworm-A, a worm that spreads by targeting computers with weak administrator and user passwords.

The worm installs several files in the fonts subfolder of the Windows fonts folder, and adds the following registry entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Runxxcm=\fonts\sys.exe

The malicious files installed by the worm are:

darkhell
fgr.bat
finger.ins
hema.exe
never.bat
s.c
too1.exe
man.bat
(detected by Sophos Anti-Virus as Troj/Noshare-N)

The worm also installs the following files, which are not malicious:

a.q - a list of words
bd.exe - a utility used for hiding windows
dex.exe - a networking utility used for running processes on other computers
fhgh.cca - a text file containing a counter
kern.exe - a utility that lists running processes
Sys.exe - a copy of the mIRC chat client
x.xx - a text file containing a list of IP ranges

More information can be found here.

Worm Tries to Spread Through IRC, FTP

W32.Kibuv.B is a new worm that attempts to spread itself through IRC and FTP, as well as by using a number of vulnerabilities on remote systems.

Technical details are at this Symantec page.

| Next Page »

Contents:
1. One of Several New Worms to Emerge This Week
2. Mass-Mailing Worm Poses as Microsoft Windows Update


Additional Articles:

  • mIRC 5.31
  • Let's Chat About Firewall Issues




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