Remove W32.Slegon

Posted on: June 30th, 2009


Discovered: June 29, 2009
Updated:

June 29, 2009 10:12:00 AM

Type:

Worm

Systems Affected:

Windows 98, Windows 95, Windows XP, Windows Me, Windows Vista, Windows NT, Windows Server 2003, Windows 2000

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Technical Details:

When the worm is executed, it creates the following file:
%System%\logon.exe

It then creates the following registry entry, so that it starts when Windows
starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Current
Version\Run\"svchost" = "C:\WINDOWS\system32\logon.exe"

The worm also modifies the following registry entry, so that it starts when
Windows starts:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\
CurrentVersion\Winlogon\"Shell" = "Explorer.exe logon.exe"

The worm then deletes the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
SafeBoot

The worm may spread by copying the following files to removable drives:
%DriveLetter%\autorun.exe
%DriveLetter%\autorun.inf

The worm creates the following registry entry, allowing it access through
the Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
\SharedAccess\Parameters\FirewallPolicy\StandardProfile\Authorized
Applications\List\"" = "%CurrentFolder%\[ORIGINALLY EXECUTED

FILE]:*:Enabled:RUNTIME_EXECUTABLE"

Next, the worm downloads files from the following Web sites:
[http://]downloadoemsoftware.com/infloat/a51[REMOVED]
[http://]joomlaprojects.cn/infloat/a51[REMOVED]
[http://]joomlaprojects.cn/bot[REMOVED]

Action Steps:
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