Dangerous and malicious file extensions list

Browse file extensions by file type category:

Dangerous and malicious file type extensions
(131 file extension database entries)

Group of file extensions, which can be dangerous and harmful for your computer, but it may be also a regular program or data files. You should run a virus scan before opening any unknown file type from this group

List of common possibly dangerous files

Dangerous and malicious file extension list

Group of file extensions, which can be dangerous and harmful for your computer, but it may be also a regular program or data files. You should run a virus scan before opening any unknown file type from this group.

Malicious software, also known as malware, is an application or a file, which is harmful to the computer user. Malicious software includes computer viruses, worms, trojan horses, spyware, adware or rootkits.

Computer virus - virus is a program or programming code, which replicates by being copied or initiating its copying to another program, computer boot sector or document. Viruses can be transmitted as attachments to an e-mail note or in a downloaded file, or can be present on a diskette or CD. Some viruses wreak their effect as soon as their code is executed, other lie dormant until circumstances cause their code to be executed by the computer.

Computer worm - worm is a self-replicating virus, which does not alter files, but resides in active memory and duplicates itself. Worms use parts of the operating system that are automatic and usually invisible to the user. It is common for worms to be noticed only after their uncontrolled replication consumes system resources, slowing or halting other tasks.

Trojan horses - trojan horse (also known as trojan), is non-self-replicating malware, which appears to perform a desirable function for the user, while facilitates unauthorized access to the user's computer system.

Spyware - spyware is any technology, which aids in gathering information about a person or organization without their knowledge. Spyware is a program that is installed in someone's computer to secretly gather information about the user and to relay it to advertisers or other interested parties. Spyware can get in the computer as a software virus or as the result of installing a new program.

Adware - adware is any software package, which automatically plays, displays or downloads advertisements to the computer after the software is installed on it or while the application is being used.

Rootkits - rootkit is a collection of programs that enable administrator-level access to a computer or computer network. Typically, a cracker installs a rootkit on a computer after first obtaining user-level access, either by exploiting a known vulnerability or cracking the password. Once the rootkit is installed, it allows the attacker to mask intrusion and gain root or privileged access to the computer and possibly also to other machines in the network.

Sort by: Extension	Sort by: File type description
file extension .9	YoutubeAdBlocke file
file extension 386	Windows virtual device driver
file extension aepl	Trojan file
file extension aru	Autorun.aru malicious data
file extension atm	Troj/ProAgent-A
file extension aut	Malware AutoStartup file
file extension bat	Batch file (executable)
file extension bhx	BinHex compressed file ASCII archive
file extension bin	Binary executable
file extension bkd	Book Library Local Dos exploit data
file extension blf	Beast Trojan File
file extension bll	VBS/European-A worm file
file extension bmw	W32/Liji-A virus file
file extension boo	Microsoft Booasm.arc encoded file archive
file extension bps	AdwareBlaster file
file extension bqf	Backdoor.Win32.Ciadoor.bqf trojan file
file extension buk	Malicious file
file extension bup	McAfee quarantined file
file extension bxz	itaup.bxz malware file
file extension capxml	Capella XML document
file extension cc	Trojan Spymaster.A text file
file extension ce0	Winewar worm file
file extension ceo	Winewar worm file
file extension cfxxe	Possibly Malware file
file extension chm	Microsoft compiled HTML help module
file extension cih	Chernobyl virus data
file extension cla	Java class data
file extension class	Java bytecode class
file extension com	Command executable
file extension ctbl	Malware encrypted file
file extension cxq	SillyDl.CXQ downloading trojan file
file extension cyw	Rbot.CYW worm file
file extension dbd	DemoShield project file
file extension delf	Malicious or virus file
file extension dev	Windows device driver
file extension dlb	Troj/Dloadr-AHT data
file extension dli	Win32.Sober.AD@mm file
file extension dll	Dynamic Link Library
file extension dllx	Backdoor.Bot data
file extension dom	DomPlayer malicious data
file extension drv	Microsoft Windows device driver
file extension dx	Win32/Alureon file
file extension dxz	Trojan backdoor virus file
file extension dyv	WORM_AUTORUN.DYV Worm file
file extension dyz	Backdoor.Win32.ProRat.dyz trojan file
file extension exe	Program executable
file extension exe1	Renamed executable file
file extension exe_renamed	Renamed EXE file
file extension ezt	Worm.Win32.AutoRun.ezt file
file extension fag	Win32.AutoRun.fag
file extension fjl	Rootkit.Win32.Agent.fjl virus file
file extension fnr	Trojan-Dropper.Win32.Flystud.lc. data
file extension fuj	Worm.Win32.AutoRun.fuj virus file
file extension gzquar	BitDefender quarantined data
file extension hlp	Help file
file extension hlw	win32/AMalum.EDHZ file
file extension hsq	Qaz Trojan data file
file extension hts	Troj/DelSpy-E file
file extension iva	Dementia.4207 virus file
file extension iws	Trojan-Downloader.JS.Agent file
file extension jar	Compressed archive file package for Java classes and data
file extension js	JavaScript source code script
file extension kcd	rshiphop.kcd malware file
file extension let	Nuke Randomic Life Generator file
file extension lik	Trojan.Win32.Agent.lik data
file extension lkh	Worm.Generic.LKH virus file
file extension lnk	Windows Shortcut
file extension lok	W32/Rbot-WE log file
file extension lpaq5	LPAQ5 compressed archive
file extension mcq	McAfee quarantined data
file extension mfu	Backdoor.Win32.Agent.mfu data
file extension mjg	Trojan file
file extension mjz	Trojan.Win32.Agent.mjz data
file extension nls	Troj/Agent-GIS file
file extension oar	HSQLDB database file
file extension ocx	ActiveX Control
file extension osa	W32/Sober-AD file
file extension ozd	Win32.TrojanDownloader.Agent.OZD trojan
file extension pcx	Paintbrush bitmap image
file extension pgm	Portable graymap file format
file extension php3	PHP version 3 script
file extension pid	W32/Yayin-A worm data file
file extension pif	Microsoft Windows program information
file extension plc	Lotus add-in functions macros applications
file extension pr	W32/Brontok-DP worm file
file extension qit	Backdoor.QIT trojan horse file
file extension qrn	Quarantine file
file extension rhk	Backdoor.Win32.Rbot.rhk data
file extension rna	Malware file
file extension rsc_tmp	Temporary file
file extension s7p	SubSeven malware
file extension scr	Microsoft Windows screensaver
file extension scr	Script
file extension shs	Microsoft Windows Shell Scrap Object
file extension ska	Happy99 virus data
file extension smm	Ami Pro macro file
file extension smtmp	Trojan:Win32/FakeSysdef folder
file extension sop	Malware word.sop data
file extension spam	Spam e-mail message
file extension ssy	W32/Sober-AD file
file extension swf	ShockWave Flash, Animated vector format for the Internet
file extension sys	System file
file extension tko	Win32/Oficla malware file
file extension tps	Scam torrent file
file extension tsa	jnana.tsa malware
file extension tti	Beast Trojan file
file extension txs	Beast Trojan file
file extension upa	Fake download file
file extension uzy	Backdoor.Sokacaps file
file extension vb	Microsoft Visual Studio Visual Basic script
file extension vba	Visual Basic VBA module
file extension vbe	Visual Basic encoded script
file extension vbs	Visual Basic script
file extension vbx	Microsoft Visual Basic Extension file
file extension vexe	Infected executable file
file extension vxd	Microsoft Windows virtual device driver
file extension vzr	Sinowal.vzr malware file
file extension wlpginstall	Possible Malware data
file extension wmf	Windows metafile format
file extension ws	Microsoft Windows script
file extension wsc	Microsoft Windows scripting component
file extension wsh	Microsoft Windows Scripting Host file
file extension xdu	Backdoor.Win32.PcClient.xdu file
file extension xir	BackDoor.Generic9.XIR trojan data
file extension xlm	Microsoft Excel macro
file extension xlv	Microsoft Excel VBA module file
file extension xnt	W32/Sober-AD file
file extension xnxx	Spyware file
file extension xtbl	deshifrovka01@gmail.com data
file extension zix	WinZix compressed archive
file extension zvz	Malware file

Dangerous and malicious file extensions

Browse file extensions by file type category:

Dangerous and malicious file extension list

Group of file extensions, which can be dangerous and harmful for your computer, but it may be also a regular program or data files. You should run a virus scan before opening any unknown file type from this group.

Browse by extension type: