IntroductionFirst of all we know that the viruses are similar to the virus in the human it can damage the body and copy it self to anther human , so I’d like to say do you know what it’s the virus !! . I think in this course you know what the virus mean , but did you know how you can protect yourself from it . I don’t care I know or not . Just me and my friends want to till you about the OS and the virus in it .

Hope you enjoy it .

• The vast majority of viruses target systems running windows . This is due to Microsoft's large market share of desktop users. The diversity of software systems on a network limits the destructive potential of viruses and malware. Open-source operating systems such as Linux allow users to choose from a variety of desktop environments, packaging tools, etc., which means that malicious code targeting any of these systems will only affect a subset of all users. Many Windows users are running the same set of applications, enabling viruses to rapidly spread among Microsoft Windows systems by targeting the same exploits on large numbers of hosts.

• Only a few major viruses have hit Macs in the last years. The difference in virus vulnerability between Macs and Windows is a chief selling point, one that Apple uses in their Get a Mac advertising

Microsoft Window viruses

The most windows viruses known :•Archiveus•CIH (computer virus)•CTX (computer virus)•Fun.exe virus•Nimda•Simile (computer virus)

• Archiveus is a computer virus for Microsoft Windows operating systems that is used as a method of extortion.

• It is a Trojan horse-type ransomware virus that encrypts the user's files. The user must then purchase something on specific Web sites to obtain the password to decrypt the files. In May 2006, it was reported that the password protection had been cracked and that the password for restoring the affected files was:mf2lro8sw03ufvnsq034jfowr18f3cszc20vmw.

• The Fun.Exe virus is of the w32.Assarm family of computer viruses. According to Symantec[1] it registers itself as a Windows system process then periodically sends mail with spreading attachments as a response to any unopened emails in Outlook Express. This virus first appeared in early 2008 and is now recognized by most anti virus programs.

• Nimda is a file infecting computer worm. It quickly spread, surpassing the economic damage caused by previous outbreaks such asCode Red. Nimda utilized several types of propagation techniques and this caused it to become the Internet’s most widespread virus/worm within 22 minutes.

• Win32/Simile (also known as Etap and MetaPHOR) is a metamorphic computer virus written in assembly language for Microsoft Windows. The virus was released in the most recent version in early March 2002. It was written by the virus writer "Mental Driller". Some of his previous viruses, such as Win95/Drill (which used the Tuareg polymorphic engine), have proved very challenging to detect.

Windows Phone

• Whether it’s the Discussions community, with over 600,000 members or the Nokia Care guys and girls on the ground, you’ll always find someone to help you get the most from your device .

• If you have one of our award-winning Lumia phones or the excellent range of Nokia feature phones including Asha, then you have an operating system that cannot be overwritten by an external program, and also nothing can be installed without your knowledge, so you are quite safe from viruses.

Can a Windows Phone handset gat a virus?

• Windows Phone 8 has no known exploits or viruses and the app sandboxing, chain of trust from the bootloader, and lack of legacy code from the classic Windows platform make it extremely unlikely to get a virus. Windows Phone has some of the same stuff that's in Windows, but it is nothing like the Windows you use on a desktop in terms of scope and configuration.

• If someone actually did have a virus and was not merely confused by a different software or hardware problem with their device, then it was probably a classic Windows Mobile device. Windows Mobile was more permissive like Android (though probably more secure even still due to the smaller system scope and central update mechanism).

Android Malwares

• The global market share of Android smartphones and tablets used for Internet access exceeded 61 percent in the first quarter of 2015. Nearly 60.85 percent of users worldwide used a mobile device with an Android operating system to go online.

• Definitive malware numbers for Android devices: G DATA security experts identified and analyzed 440,267 new malware samples in the first quarter of 2015

• Financially motivated Android malware makes up around half of the malware analysis (50.3 percent). This type of malware includes banking Trojans, ransomware, SMS Trojans.

Android Trojan

• The FakeRun Android Trojan

• does not steal users’ personal data, It belongs to a vast family of dummy applications that do nothing but display ads that earn money for their creator

Current Android Malwares

• Here is the some of Android-Malware-Families with their main capabilities.

• AccuTrackThis application turns an Android smartphone into a GPS tracker.

• AcnetdoorThis Trojan opens a backdoor on the infected device and sends the IP address to a remote server.

• DroidSheepThis application can capture and hijack unencrypted web sessions

• Source : http://forensics.spreitzenbarth.de/android-malware/

Linux Malwares

Linux malware includes viruses, trojans, worms and other types of malware that affect the Linux operating system. Linux, Unix like computer operating systems are generally regarded as very well-protected against, but not immune to, computer viruses.

There has not yet been a single widespread Linux virus or malware infection of the type that is common on Microsoft Windows; this is attributable generally to the malware's lack of root access and fast updates to most Linux vulnerabilities.

Viruses And Trojans

• If an infected binary containing one of the viruses were run, the system would be temporarily infected; Linux kernel is memory resident and read-only. Any infection level would depend on which user with what privileges ran the binary. A binary run under the root account would be able to infect the entire system. Privilege escalation vulnerabilities may permit malware running under a limited account to infect the entire system.

Linux Threats

Viruses: Coin, Diesel, HasherRootkits : Snakso-A (Web server)Trojans: Hand of Thief (banking trojan)Worms: Bad Bunny

Mac OSThe idea that you don’t have to worry about viruses or malware if you have a Mac is still surprisingly popular. Many people believe that Macs can’t get viruses, and Apple does little to dispel that notion, but is it really true? Can Macs get viruses?

A few years ago, Flashback malware exploited a security flaw in Java. It managed to infect 600,000 Macs, which was roughly 1 percent of the user base. There is a page about it on Apple’s website.There have been other problems since then. The KitM.A backdoor application on OS X was able to take screenshots of user’s desktops. More recently, the Rootpipe exploit has been proving difficult to fix.

“Mac OS X software has more high-risk vulnerabilities than all versions of Windows put together,” explains Bogdan, “Apple markets these products as virus-free. They say you don’t need an antivirus, because they know people hate antivirus software. These utilities often slow down your computer, so they don’t want to promote them.”

• Apple has also been criticized for being slow to deal with threats and shut vulnerabilities down. Rootpipe was discovered in October 2014, but the fix only came out this month (April 2015), and it only patches Yosemite, not older editions of OS X. To make matters worse, the patch doesn’t actually fix the problem properly. Apple’s big rival may have a bad reputation, but it has taken decisive action to tackle that perception.

• We have discovered and registered more than 48 million new unique malware samples this year alone, but more than 98% have been written for the Windows platform,” says Andreas Marx, AV-Test CEO, “Less than 5,000 new viruses were written for Mac OS X, but these kinds of malicious software do exist.”

المشروع على : العاملين

الحلو -2012203091 سامي . احمدصالحات -2012205792 عاصم . عصام

طراد -2012202953 محمود . قيس-4