What is trillian.exe?

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the trillian.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

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Trillian.exe file information

Windows Task Manager with trillian
Trillian.exe process in Windows Task Manager

The process known as Trillian belongs to software Chat Client or Trillian by Cerulean Studios (

Description: Trillian.exe is not essential for the Windows OS and causes relatively few problems. The file trillian.exe is located in a subfolder of "C:\Program Files" (normally C:\Program Files\Trillian\). Known file sizes on Windows 10/8/7/XP are 1,873,280 bytes (43% of all occurrences), 1,222,144 bytes and 10 more variants. 
The program has a visible window. The trillian.exe file is not a Windows core file. It is able to record keyboard inputs. The application can be uninstalled in the Control Panel. The software listens for or sends data on open ports to a LAN or the Internet. The file is a Verisign signed file. Trillian.exe is able to monitor applications and record keyboard and mouse inputs. Therefore the technical security rating is 38% dangerous; however you should also read the user reviews.

Uninstalling this variant: The software publisher Trillian provides direct support ( and update information ( You could uninstall Trillian or Chat Client software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Recommended: Identify trillian.exe related errors

If trillian.exe is located in a subfolder of C:\, the security rating is 26% dangerous. The file size is 1,873,280 bytes. The program has a visible window. The trillian.exe file is a Verisign signed file. Trillian.exe is certified by a trustworthy company. The file is able to record keyboard inputs. It is not a Windows system file. The program uses ports to connect to or from a LAN or the Internet. Trillian.exe is able to record keyboard and mouse inputs and monitor applications.

Important: Some malware camouflages itself as trillian.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the trillian.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

chat client
  nassing   (further information)
Trillian Messenger - ungefährlich
chat programm
Multi-network chat client
  Nick   (further information)
chat program, trillian
  its_me   (further information)
p/o Trillian Messsenger services
Instant Messenger
  tester   (further information)
Multi-protocol chat program
  Ryan   (further information)
As far as I can tell, only runs when trillian client is running
sends private information
  Michael   (further information)
Trillian is perfectly safe.
chat client
Shareware you need to pay for full features, blocking install of my Netzero upgrade so need to remove all traces shown by Spyware Terminator
  John Trek   (further information)
Trillian Astra chat client
it is the best to receive multiple chats at one id.
  Jack   (further information)
Its taken £74.50 out of my account and ive neva herd of it!!!
Norton Internet Security Version 18.7.23 reported the following:  11/24/2015 11:55 AM, High(Risk),trillian.exe (Trojan.Gen.2) detected by Auto-Protect,Quarantined,Resolved - c:\program files (x86)\trillian\trillian.exe

Rating chart

Summary: Average user rating of trillian.exe: based on 33 votes with 19 user comments. 30 users think trillian.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. 2 users think trillian.exe is dangerous and recommend removing it. One user is not sure about it.

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Best practices for resolving trillian issues

A clean and tidy computer is the key requirement for avoiding problems with trillian. This means running a scan for malware, cleaning your hard drive using 1cleanmgr and 2sfc /scannow, 3uninstalling programs that you no longer need, checking for Autostart programs (using 4msconfig) and enabling Windows' 5Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the 6resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the 7DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the trillian.exe process on your computer, the following programs have proven to be helpful: ASecurity Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. BMalwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

trillian.exe [all]