Threat Description

Hooker

Details

Aliases:Hooker, Trojan.PSW.Hooker
Category:Malware
Type:Trojan
Platform:W32

Summary



IMPORTANT NOTE: If you have been affected by this trojan, change your Windows domain and RAS password immediately.

Hooker is a password and data stealing trojan. Being run it installs itself as KERN32.EXE (name may differ in different versions) into \Windows\System\ directory and modifies RunOnce key in the Registry to be run during next Windows session. When activated next time the trojan renews the RunOnce key, so it becomes active during all Windows sessions.



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.



Technical Details



After initial installation the trojan drops a keylogging DLL from inside its body (as HKSDLL.DLL, but the name can be different in different versions) and registers itself as a service process. This way its task is not visible in Task Manager.

The trojan monitors keyboard commands, captures logins and passwords for RAS (Remote Access Server), gets information about a network (IPs, passwords, scripts) where an infected computer is connected to and sends all this info to an e-mail address that is stored in encrypted format in the trojan's body. The trojan uses an anonymous mail server to send e-mails, the name of the server is also stored in the trojan's body in encrypted form.

The trojan is installed on an infected system for a limited time. After its time limit expires, the trojan deletes itself from a system.





Technical Details: Alexey Podrezov; F-Secure Corp.; May 2001


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