Classification

Category: Malware

Type: Trojan

Aliases: Hooker, Trojan.PSW.Hooker

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

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

Knowledge Base

Find the latest advice in our Community Knowledge Base.

About the product

See the manual for your F-Secure product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

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 email address that is stored in encrypted format in the trojan's body. The trojan uses an anonymous mail server to send emails, 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.