Remove Lehs. Description and removal instructions

 
Title: Lehs

Type: Worms
Severity scale:Lehs severity is 80  (80 / 100)
 
Lehs is a dangerous Internet worm with a devastating payload. It spreads by e-mail in messages with infected executable attachments. These messages look like Microsoft support letters providing a patch for certain Windows vulnerabilities. Once the user executes an attached file, the parasite installs itself to the system and creates a lot of directories and infected files in different locations. Then Lehs deletes all the executables it finds in the default system directory C:\Windows\System or C:\Windows\System32. During the deletion the parasite displays numerous messages revealing its presence in the system. Lehs also can attempt to perform a DoS attack against predetermined remote hosts. The worm runs on every Windows startup.


Lehs properties:
• Connects itself to the internet
• Hides from the user
• Stays resident in background

Automatic Lehs removal:

remover for Lehs

Lehs manual removal:

Kill processes:
backup.exe, bin.exe, dage.exe, gadeth.exe, kern16.exe, kernel32.exe, microcorp.exe, micropackage.exe, msiinstall.exe, msishell.exe, mtk.exe, ndad.exe, notepad.exe, patch.exe, patch[X].exe, reinstall.exe, restoreshell.exe, shell.exe, splinter.exe, win-16_bit.exe, wincom.exe, windows.exe
Delete files:
backup.exe, bin.exe, dage.exe, gadeth.exe, kern16.exe, kernel32.exe, microcorp.exe, micropackage.exe, msiinstall.exe, msishell.exe, mtk.exe, ndad.exe, notepad.exe, patch.exe, patch[X].exe, reinstall.exe, restoreshell.exe, shell.exe, splinter.exe, win-16_bit.exe, wincom.exe, windows.exe, msdos_3.bat
Delete directories:
C:\Windows\System\Sysrestore
C:\Windows\System32\Sysrestore
C:\[random name]
Misc:
[X] is a set of random characters and digits.

Lehs modifies essential configuration files of Windows 95/98/ME systems. Open the win.ini and system.ini files located in C:\Windows\System or C:\Windows\System32 folder and delete the following lines:
run=C:\Windows\System\Sysrestore\shell.exe
run=C:\Windows\System32\Sysrestore\shell.exe
run=C:\Windows\System\Sysrestore\notepad.exe
run=C:\Windows\System32\Sysrestore\notepad.exe

Locate the autoexec.bat file (it usually can be found in the root of the main hard disk - C:) and delete the following lines:
start C:\Windows\System\Sysrestore\notepad.exe
start C:\Windows\System32\Sysrestore\notepad.exe

Other programs to remove Lehs:

• Malwarebytes Anti Malware - Review - Download
• Malwarebytes Anti Malware - Review - Download
• Windows Defender - Review - Download

Information added: 19/03/04
Information updated: 01/10/05

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