Home > Threat descriptions >



Category: Malware

Type: Trojan

Aliases: Trojan:W32/Daonol.gen!C, Trojan-PSW.Win32.Kates.c, Trojan.Agent


Trojan:W32/Daonol.gen!C is the generic detection for a program that steals information from the user, including passwords.

Generic detections are broad patterns of code or behavior that are used by security software to identify programs or files. If you suspect the detected file was incorrectly identified, go to: Removal: Resolve a False Positive.


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.

Resolve a False Positive

Security programs will sometimes unintentionally identify a clean program or file as malicious if its code or behavior is similar to a known harmful program or file. This is known as a False Positive. In most cases, a False Positive is fixed in a subsequent database release. If you suspect the detected file is a False Positive, you can:

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


The malware adds the following file to the parent directory of where it was executed:

  • %cwd%\...\[random filename]

For example, if the program is run in C:\Windows\System32, the file is dropped in C:\Windows.

The malware then creates this registry :

  • HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Drivers32 aux[n+1] = [path to random filename]

Where n is the existing number of aux (e.g., if your machine originally has aux and aux2 the malware will create aux3)

Once the trojan has executed (and delivered its payload), it deletes itself.


Once installed, Daonol will inject itself into system processes and steal information, including passwords, from the user.

It will also blocks execution of regedit and bat files.


If the file dropped by the trojan is manually deleted by the user, it is automatically restored by the injected processes.

As the malware prevents execution of the regedit file, not being able to run regedit can be taken as a sign the computer may be infected.