Dangerous and malicious file extensions list

Browse file extensions by file type category:

Dangerous and malicious file type extensions
(132 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 dll	Dynamic Link Library
file extension exe	Program executable
file extension sys	System file
file extension swf	ShockWave Flash, Animated vector format for the Internet
file extension jar	Compressed archive file package for Java classes and data
file extension lnk	Windows Shortcut
file extension gzquar	BitDefender quarantined data file
file extension zix	WinZix compressed archive
file extension js	JavaScript source code script
file extension scr	MS Windows screensaver
file extension bat	Batch file (executable)
file extension ws	Microsoft Windows script
file extension vbs	Visual Basic script
file extension bin	Binary executable
file extension ocx	ActiveX Control
file extension aru	Autorun.aru malicious data
file extension ozd	Win32.TrojanDownloader.Agent.OZD trojan
file extension com	Command executable
file extension wmf	Windows Metafile Format
file extension drv	Microsoft Windows device driver
file extension class	Java bytecode class
file extension chm	Microsoft compiled HTML help module
file extension shs	Microsoft Windows Shell Scrap Object
file extension pgm	Portable graymap file format
file extension dev	Windows device driver
file extension xlm	Microsoft Excel macro
file extension pif	Microsoft Windows program information
file extension 0_full_0_tgod_signed	CrossFire_OBV4.8.3.0_Full_0_tgod_signed.exe
file extension vba	Visual Basic VBA module
file extension boo	Microsoft Booasm.arc encoded file archive
file extension xnxx	Spyware file
file extension vbe	Visual Basic encoded script
file extension vxd	Microsoft Windows virtual device driver
file extension tps	Scam torrent file
file extension pcx	Paintbrush bitmap image
file extension tsa	jnana.tsa malware
file extension sop	Malware word.sop data
file extension hlp	Help file
file extension 386	Windows virtual device driver
file extension vb	Microsoft Visual Studio Visual Basic script
file extension bkd	Book Library Local Dos exploit data
file extension rhk	Backdoor.Win32.Rbot.rhk data
file extension exe1	Renamed executable
file extension cih	Chernobyl virus data
file extension vbx	Microsoft Visual Basic Extension
file extension lik	Trojan.Win32.Agent.lik data
file extension exe_renamed	Renamed EXE file
file extension osa	W32/Sober-AD data
file extension dyz	Backdoor.Win32.ProRat.dyz trojan file
file extension dyv	WORM_AUTORUN.DYV worm data
file extension kcd	rshiphop.kcd malware
file extension wsc	Microsoft Windows scripting component
file extension s7p	SubSeven malware
file extension dlb	Troj/Dloadr-AHT data
file extension .9	YoutubeAdBlocke data
file extension dom	DomPlayer malicious data
file extension php3	PHP version 3 script
file extension dxz	Trojan backdoor virus data
file extension mjg	Trojan data
file extension mfu	Backdoor.Win32.Agent.mfu data
file extension cla	Java class data
file extension hlw	win32/AMalum.EDHZ data
file extension rsc_tmp	Temporary data
file extension mjz	Trojan.Win32.Agent.mjz data
file extension bup	McAfee quarantined data
file extension bhx	BinHex compressed file ASCII archive
file extension upa	Fake download
file extension mcq	McAfee quarantined data
file extension dli	Win32.Sober.AD@mm file
file extension txs	Beast Trojan data
file extension fnr	Trojan-Dropper.Win32.Flystud.lc. data
file extension xlv	Microsoft Excel VBA module
file extension xir	BackDoor.Generic9.XIR trojan data
file extension cxq	SillyDl.CXQ downloading trojan data
file extension bxz	itaup.bxz malware data
file extension xdu	Backdoor.Win32.PcClient.xdu data
file extension ska	Happy99 virus data
file extension wsh	Microsoft Windows Scripting Host data
file extension wlpginstall	Possible Malware data
file extension cfxxe	Possibly Malware file
file extension tti	Beast Trojan data
file extension vexe	Infected executable
file extension qrn	Quarantine data
file extension dllx	Backdoor.Bot data
file extension fag	Win32.AutoRun.fag
file extension xtbl	deshifrovka01@gmail.com data
file extension smtmp	Trojan:Win32/FakeSysdef folder
file extension ceo	Winewar worm data
file extension tko	Win32/Oficla malware data
file extension scr	Script
file extension uzy	Backdoor.Sokacaps data
file extension oar	HSQLDB database
file extension bll	VBS/European-A worm file
file extension plc	Lotus add-in functions macros applications
file extension spam	Spam e-mail message
file extension ssy	W32/Sober-AD file
file extension dbd	DemoShield project
file extension smm	Ami Pro macro
file extension ce0	Winewar worm data
file extension zvz	Malware data
file extension cc	Trojan Spymaster.A text document
file extension blf	Beast Trojan data
file extension ctbl	Malware encrypted data
file extension iws	Trojan-Downloader.JS.Agent data
file extension vzr	Sinowal.vzr malware data
file extension nls	Troj/Agent-GIS data
file extension hsq	Qaz Trojan data
file extension lkh	Worm.Generic.LKH virus data
file extension aepl	Trojan data
file extension rna	Malware data
file extension hts	Troj/DelSpy-E data
file extension let	Nuke Randomic Life Generator data
file extension aut	Malware AutoStartup data
file extension delf	Malicious or virus data
file extension buk	Malicious data
file extension fuj	Worm.Win32.AutoRun.fuj virus data
file extension atm	Troj/ProAgent-A data
file extension ezt	Worm.Win32.AutoRun.ezt data
file extension fjl	Rootkit.Win32.Agent.fjl virus data
file extension bmw	W32/Liji-A virus data
file extension dx	Win32/Alureon data
file extension cyw	Rbot.CYW worm data
file extension iva	Dementia.4207 virus data
file extension pid	W32/Yayin-A worm data
file extension bps	AdwareBlaster data
file extension capxml	Capella XML document
file extension bqf	Backdoor.Win32.Ciadoor.bqf trojan
file extension pr	W32/Brontok-DP worm file
file extension qit	Backdoor.QIT trojan horse data
file extension xnt	W32/Sober-AD data
file extension lok	W32/Rbot-WE log file
file extension lpaq5	LPAQ5 compressed archive

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: