Exterminate It! Antimalware


Known threats:699,742 Last Update:November 20, 22:46


My browser was taking 10 to 15 seconds to load up instead of being instant. Three of the top anti spyware programs insisted all was well. However a few simple instructions from your team and the problem was magically solved.

Nelson S.

File: --((Mutex))--.dat

Location of --((Mutex))--.dat and Associated Malware

Check whether --((Mutex))--.dat is present in the following locations:

Windows 2000, Windows XP, Windows Server 2003 specific --((Mutex))--.dat file locations:

  • C:\Documents And Settings\USER_NAME\Application Data\Microsoft\Windows\--((Mutex))--.dat
  • C:\Documents And Settings\USER_NAME\Application Data\--((Mutex))--.dat

Windows Vista, Windows Server 2008, Windows 7, Windows 8 specific --((Mutex))--.dat file locations:

  • C:\Users\USER_NAME\AppData\Roaming\Microsoft\Windows\--((Mutex))--.dat
  • C:\Users\USER_NAME\AppData\Roaming\--((Mutex))--.dat

If you find --((Mutex))--.dat file in any of these locations, your computer is very likely to be infected with the following malware:

IMPORTANT: Malware files can be camouflaged with the same file names as legitimate files. The --((Mutex))--.dat file is associated with malware only if found in the locations listed above.


Different Variations of --((Mutex))--.dat File^

File SizeFile Md5Last Seen
1264840BE69DC853730C49B16D036C2EEFE73DFJan 20, 2013
12396A25792ACB53A007BDED48DBF232FB060Feb 10, 2013
3368662E48255226D65305DE55D2A514B6331E7Feb 23, 2013
2416240136EBF7E36181EA156BC674CADB122Feb 26, 2013
168136E4CB81DD93E7EF0C924190F7EAE4DAA8Mar 9, 2013
7117998AFF76E257FCF00DBDE8C98EA2FDFD712May 24, 2013
366403234A485D18A403DE6AFC0AFA719BE8EJun 17, 2013
21838B2EC6ABD7E6C45FEBB0906ED487EA752Jun 18, 2013
1032DF0BAA3CD2DD1BD52D0179FB76E418E2Jul 24, 2013
41199697D469EB600661A5EDB48A74E00EA8FAAug 28, 2013
1406373E7BE35A147C58A893A77FBC326C04Sep 6, 2013
43828E7AD2F52731047F5F8E4DC3D3B218B7Feb 25, 2014
77172001BD05874C40382FB45EDFBE77730C8Jun 24, 2014
916D812703C99DC66E21E701A95D8CCFD5CJul 1, 2014
38141FF9F5F19662CE5EEB727335E0692955Aug 4, 2014
397222B9970F5DFD9B6DCA872A25F1ADA08BC1Nov 6, 2014
24365D69E2469E59040CC3CD827755B7F8D8Apr 1, 2015
489071CB7602775319F0501C3C7CF3972693Aug 23, 2015
6435097CE71FAAA973E44C46AA82C4DFE18C7Sep 20, 2015
34043616A0862342050AD7DA6FB7F8F835872DOct 14, 2015
4264084D4EF41AF8B61E0F87651E1F8B7F8EB6Nov 4, 2015
7488270F53FCB0384071C129281DFAE0F2965Jan 7, 2016
1238092A9B85289E3AFA128621F55C6AD3AADMar 1, 2016
15465202A6246D4E086E82781E38089E4F3511A9Mar 12, 2016
1250920BF6BFF863B294DAC5AEF28EE86D6BDec 4, 2016
48116E65B1239444A591296376E0C2266C494Feb 22, 2017
832600C054F63E7D6DD7FF363E41BA08E81751Mar 12, 2017
17330925AA19DEC07293542265ECF4856A891Jul 11, 2015

Why Is It Important to Remove Malware Files?^

It is imperative that you delete malware-associated files as soon as possible because they can be used - or are already being used - to inflict serious damage on your PC, including:

  • Disrupting the normal functioning of the operating system or rendering it completely useless.
  • Hijacking valuable private information (credit card numbers, passwords, PIN codes, etc.)
  • Directing all your Web searches to the same unwanted or malicious sites.
  • Dramatically slowing down your computer.
  • Gaining total control of your PC to spread viruses and trojans and send out spam.

How to Remove --((Mutex))--.dat^

  1. To enable deleting the --((Mutex))--.dat file, terminate the associated process in the Task Manager as follows:
    • Right-click in the Windows taskbar (a bar that appears along the bottom of the Windows screen) and select Task Manager on the menu.
    • In the Tasks Manager window, click the Processes tab.
    • On the Processes tab, select --((Mutex))--.dat and click End Process.
  2. Using your file explorer, browse to the file using the paths listed in Location of --((Mutex))--.dat and Associated Malware.
  3. Select the file and press SHIFT+Delete on the keyboard.
  4. Click Yes in the confirm deletion dialog box.
  5. Repeat steps 2-4 for each location listed in Location of --((Mutex))--.dat and Associated Malware.
  6. Notes:

    • The deletion of --((Mutex))--.dat will fail if it is locked; that is, it is in use by some application (Windows will display a corresponding message). For instructions on deleting locked files, see Deleting Locked Files.
    • The deletion of --((Mutex))--.dat will fail if your Windows uses the NT File System (NTFS) and you have no write rights for the file. Request your system administrator to grant you write rights for the file.

Deleting Locked Files^

You can delete locked files with the RemoveOnReboot utility. You can install the RemoveOnReboot utility from here.

After you delete a locked file, you need to delete all the references to the file in Windows registry.

To delete a locked file:

  1. Right-click on the file and select Send To -> Remove on Next Reboot on the menu.
  2. Restart your computer.

The file will be deleted on restart.

Note: In the case of complex viruses that can replicate themselves, malware files can reappear in the same locations even after you have deleted those files and restarted your computer. Exterminate It! Antimalware can effectively eradicate such viruses from your computer.

To remove all registry references to a --((Mutex))--.dat malware file:

  1. On the Windows Start menu, click Run.
  2. In the Open box, type regedit and click OK. The Registry Editor window opens.
  3. On the Edit menu, select Find.
  4. In the Find dialog box, type --((Mutex))--.dat. The name of the first found registry value referencing --((Mutex))--.dat is highlighted in the right pane of the Registry Editor window.
  5. Right-click the registry value name and select Delete on the menu.
  6. Click Yes in the Confirm Value Delete dialog box.
  7. To delete all other references to --((Mutex))--.dat, repeat steps 4-6.
IMPORTANT: Malware files can masquerade as legitimate files by using the same file names. To avoid deleting a harmless file, ensure that the Value column for the registry value displays exactly one of the paths listed in Location of --((Mutex))--.dat and Associated Malware.