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W32/Krisworm-A

by Marianna Schmudlach / March 31, 2004 11:42 PM PST

Type
Win32 worm

Description
W32/Krisworm-A is a worm which spreads by targeting computers with weak administrator and user passwords.
The worm installs several files in the fonts subfolder of the Windows fonts folder adds the registry entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\xxcm
= <Windows fonts>\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 list running processes

Sys.exe - a copy of the mIRC chat client.

x.xx - a text file containing a list of IP ranges

W32/Krisworm-A attempts to copy itself to the admin$ share on remote computers and execute the copy. The worm acts as a backdoor and IRC proxy server, allowing a remote attacker to control the infected computer.

http://www.sophos.com/virusinfo/analyses/w32krisworma.html

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