- Malwarebytes highlighted that malicious code was spreading in pirated copies of Little Snitch and other Mac programs on a Russian torrent forum Rutracker. The program attempts to install itself in.
- Disease outbreaks Statement on the meeting of the IHR Emergency Committee for Ebola virus disease in the Democratic Republic of the Congo 12 February 2020 - It was the unanimous view of the Emergency Committee that Ebola virus disease outbreak in Democratic Republic of the Congo still constitutes a public health emergency of international.
OS X v10.5.1 and later include an application firewall you can use to control connections on a per-application basis (rather than a per-port basis). This makes it easier to gain the benefits of firewall protection, and helps prevent undesirable apps from taking control of network ports open for legitimate apps.
Viral Outbreak Mac Os 11
Configuring the application firewall in OS X v10.6 and later
Use these steps to enable the application firewall:
In Q1 2020, Apple and Google were neck-and-neck: Windows grabbed 87.5% market share, macOS took 5.8%, and Chrome OS captured 5.3%. But in Q2 2020, Windows fell to 81.7%, macOS grew to 7.6%,.
- Choose System Preferences from the Apple menu.
- Click Security or Security & Privacy.
- Click the Firewall tab.
- Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
- Click 'Turn On Firewall' or 'Start' to enable the firewall.
- Click Advanced to customize the firewall configuration.
Configuring the Application Firewall in Mac OS X v10.5
Viral Outbreak Mac Os X
Make sure you have updated to Mac OS X v10.5.1 or later. Then, use these steps to enable the application firewall:
- Choose System Preferences from the Apple menu.
- Click Security.
- Click the Firewall tab.
- Choose what mode you would like the firewall to use.
Advanced settings
Block all incoming connections
Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:
- configd, which implements DHCP and other network configuration services
- mDNSResponder, which implements Bonjour
- racoon, which implements IPSec
To use sharing services, make sure 'Block all incoming connections' is deselected.
Allowing specific applications
To allow a specific app to receive incoming connections, add it using Firewall Options:
- Open System Preferences.
- Click the Security or Security & Privacy icon.
- Select the Firewall tab.
- Click the lock icon in the preference pane, then enter an administrator name and password.
- Click the Firewall Options button
- Click the Add Application (+) button.
- Select the app you want to allow incoming connection privileges for.
- Click Add.
- Click OK.
You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.
Automatically allow signed software to receive incoming connections
Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.
Block all incoming connections
Selecting the option to 'Block all incoming connections' prevents all sharing services, such as File Sharing and Screen Sharing from receiving incoming connections. The system services that are still allowed to receive incoming connections are:
- configd, which implements DHCP and other network configuration services
- mDNSResponder, which implements Bonjour
- racoon, which implements IPSec
To use sharing services, make sure 'Block all incoming connections' is deselected.
Allowing specific applications
To allow a specific app to receive incoming connections, add it using Firewall Options:
- Open System Preferences.
- Click the Security or Security & Privacy icon.
- Select the Firewall tab.
- Click the lock icon in the preference pane, then enter an administrator name and password.
- Click the Firewall Options button
- Click the Add Application (+) button.
- Select the app you want to allow incoming connection privileges for.
- Click Add.
- Click OK.
You can also remove any apps listed here that you no longer want to allow by clicking the Remove App (-) button.
Automatically allow signed software to receive incoming connections
Applications that are signed by a valid certificate authority are automatically added to the list of allowed apps, rather than prompting the user to authorize them. Apps included in OS X are signed by Apple and are allowed to receive incoming connections when this setting is enabled. For example, since iTunes is already signed by Apple, it is automatically allowed to receive incoming connections through the firewall.
If you run an unsigned app that is not listed in the firewall list, a dialog appears with options to Allow or Deny connections for the app. If you choose Allow, OS X signs the application and automatically adds it to the firewall list. If you choose Deny, OS X adds it to the list but denies incoming connections intended for this app.
If you want to deny a digitally signed application, you should first add it to the list and then explicitly deny it.
Some apps check their own integrity when they are opened without using code signing. If the firewall recognizes such an app it doesn't sign it. Instead, it the 'Allow or Deny' dialog appears every time the app is opened. This can be avoided by upgrading to a version of the app that is signed by its developer.
Enable stealth mode
Enabling stealth mode prevents the computer from responding to probing requests. The computer still answers incoming requests for authorized apps. Unexpected requests, such as ICMP (ping) are ignored.
Firewall limitations
The application firewall is designed to work with Internet protocols most commonly used by applications – TCP and UDP. Firewall settings do not affect AppleTalk connections. The firewall may be set to block incoming ICMP 'pings' by enabling Stealth Mode in Advanced Settings. Earlier ipfw technology is still accessible from the command line (in Terminal) and the application firewall does not overrule any rules set using ipfw. If ipfw blocks an incoming packet, the application firewall does not process it.
OSX.FlashBack,[1] also known as the Flashback Trojan, Fakeflash, or Trojan BackDoor.Flashback, is a Trojan horse affecting personal computer systems running Mac OS X.[2][3] The first variant of Flashback was discovered by antivirus company Intego in September 2011.[4]
Infection[edit]
According to the Russian antivirus company Dr. Web, a modified version of the 'BackDoor.Flashback.39' variant of the Flashback Trojan had infected over 600,000 Mac computers, forming a botnet that included 274 bots located in Cupertino, California.[5][6] The findings were confirmed one day later by another computer security firm, Kaspersky Lab.[7] This variant of the malware was first detected in April 2012[8] by Finland-based computer security firm F-Secure.[9][10] Dr. Web estimated that in early April 2012, 56.6% of infected computers were located within the United States, 19.8% in Canada, 12.8% in the United Kingdom and 6.1% in Australia.[6]
Details[edit]
The original variant used a fake installer of Adobe Flash Player to install the malware, hence the name 'Flashback'.[4]
A later variant targeted a Java vulnerability on Mac OS X. The system was infected after the user was redirected to a compromised bogus site, where JavaScript code caused an applet containing an exploit to load. An executable file was saved on the local machine, which was used to download and run malicious code from a remote location. The malware also switched between various servers for optimized load balancing. Each bot was given a unique ID that was sent to the control server.[6] The trojan, however, would only infect the user visiting the infected web page, meaning other users on the computer were not infected unless their user accounts had been infected separately.[11]
Resolution[edit]
Oracle, the company that develops Java, fixed the vulnerability exploited to install Flashback on February 14, 2012.[8] However, at the time of Flashback's release, Apple maintained the Mac OS X version of Java and did not release an update containing the fix until April 3, 2012,[12] after the flaw had already been exploited to install Flashback on 600,000 Macs.[13] On April 12, 2015, the company issued a further update to remove the most common Flashback variants.[14] The updated Java release was only made available for Mac OS X Lion and Mac OS X Snow Leopard; the removal utility was released for Intel versions of Mac OS X Leopard in addition to the two newer operating systems. Users of older operating systems were advised to disable Java.[12] There are also some third party programs to detect and remove the Flashback trojan.[13] Apple worked on a new process that would eventually lead to a release of a Java Runtime Environment (JRE) for Mac OS X at the same time it would be available for Windows, Linux, and Solaris users.[15] As of January 9, 2014, about 22,000 Macs were still infected with the Flashback trojan.[16]
See also[edit]
References[edit]
- ^This is the name used in Apple's built-in anti-malware software XProtect. Other antivirus software vendors may use different names.
- ^5 April 2012, Flashback Trojan botnet infects 600,000 Macs, Siliconrepublic
- ^5 April 2012, 600,000 infected Macs are found in a botnet, The Inquirer
- ^ abSeptember 26, 2011, Mac Flashback Trojan Horse Masquerades as Flash Player Installer Package, Intego Security
- ^Jacqui Cheng, 4 April 2012, Flashback Trojan reportedly controls half a million Macs and counting, Ars Technica
- ^ abc4 April 2012, Doctor Web exposes 550 000 strong Mac botnet Dr. Web
- ^Chloe Albanesius, 6 April 2012, Kaspersky Confirms Widespread Mac Infections Via Flashback Trojan, PCMag
- ^ ab'Half a million Mac computers 'infected with malware''. BBC. April 5, 2012. Retrieved April 5, 2012.CS1 maint: discouraged parameter (link)
- ^April 2, 2012, Mac Flashback Exploiting Unpatched Java Vulnerability F-Secure's News from the Lab
- ^11 April 2012, Apple crafting weapon to vanquish Flashback virus, Sydney Morning Herald
- ^Kessler, Topher. 'How to remove the Flashback malware from OS X'. CNET.
- ^ ab'About Flashback malware'. Apple. April 10, 2012. Retrieved April 12, 2012.CS1 maint: discouraged parameter (link)
- ^ ab'flashbackcheck.com'. Kaspersky. April 9, 2012. Retrieved April 12, 2012.CS1 maint: discouraged parameter (link)
- ^'About Java for OS X Lion 2012-003'. Apple. April 12, 2012. Retrieved April 12, 2012.CS1 maint: discouraged parameter (link)
- ^'Mac Security: A Myth?'. eSecurity Planet. April 13, 2012. Retrieved April 16, 2012.CS1 maint: discouraged parameter (link)
- ^'It's alive! Once-prolific Flashback trojan still infecting 22,000 Macs'. January 9, 2014. Retrieved January 9, 2014.CS1 maint: discouraged parameter (link)
External links[edit]
- Apple Delays, Hackers Play April 12, 2012
