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For remove AplS.Saprilt.B virus,please run antivirus Run a full system scan and clean/delete all AplS.Saprilt.B infected files and Delete/Modify any values added to the registry. Navigate to the subkey and delete the values as following AplS.Saprilt.B details:
Once executed, the Trojan creates the following files:
- /Users/Shared/SC Info/.candidates
- /Users/Shared/SC Info/.accounts
- /Users/Shared/SC Info/.hashes
- ~/Public/.howdy
- /Users/Shared/.howdy
- /Library/WebServer/Documents/.howdy
- /Library/WebServer/Documents/.PS_STORE/AUTHORS
- /Library/WebServer/Documents/.PS_STORE/ChangeLog
- /Library/WebServer/Documents/.PS_STORE/SECURITY
- /Library/WebServer/Documents/.PS_STORE/COPYING
- /Library/WebServer/Documents/.PS_STORE/INSTALL
- /Library/WebServer/Documents/.PS_STORE/phpshell.php
- /Library/WebServer/Documents/.PS_STORE/pwhash.php
- /Library/WebServer/Documents/.PS_STORE/README
- /Library/WebServer/Documents/.PS_STORE/style.css
- /Library/WebServer/Documents/.PS_STORE/config.php
- ~/Sites/images/.PS_STORE/AUTHORS
- ~/Sites/images/.PS_STORE/ChangeLog
- ~/Sites/images/.PS_STORE/SECURITY
- ~/Sites/images/.PS_STORE/COPYING
- ~/Sites/images/.PS_STORE/INSTALL
- ~/Sites/images/.PS_STORE/phpshell.php
- ~/Sites/images/.PS_STORE/pwhash.php
- ~/Sites/images/.PS_STORE/README
- ~/Sites/images/.PS_STORE/style.css
- ~/Sites/images/.PS_STORE/config.php
It installs a back door on the computer, which may allow a remote attacker to perform the following actions:
- Attempt to add the user named "USER" with a blank password to the /etc/sudoers folder using the following vulnerability:
Apple Mac OS X AppleScript ARDAgent Shell Local Privilege Escalation Vulnerability (BID 29831) - Attempt to add the user "nobodyd" with password "a secret" on the computer
- Attempt to modify the Apache httpd.conf file, in order to load the PHP library, and then activate the Apache Webserver
- Install a shell that attempts to connect back to the attacker every hour by using crontab
- Attempt to connect back to the attacker through a VNC connection every hour by using crontab
- Install a PHP shell inside /Library/WebServer/Documents/.PS_STORE/ or ~/Sites/images/.PS_STORE/
The Trojan then attempts to exploit the following vulnerability, if it fails to get root privileges on the compromised computer:
Apple Mac OS X Pre 10.4.8 Multiple Security Vulnerabilities (BID 20271)
NOTE: This vulnerability affects OS X 10.4 through 10.4.7.
Next, it may create the following files:
- /Library/Caches/AStht_v06.app/Contents
- /Library/Caches/AStht_v06.app/Contents/Info.plist
- /Library/Caches/AStht_v06.app/Contents/MacOS
- /Library/Caches/AStht_v06.app/Contents/MacOS/applet
- /Library/Caches/AStht_v06.app/Contents/PkgInfo
- /Library/Caches/AStht_v06.app/Contents/Resources
- /Library/Caches/AStht_v06.app/Contents/Resources/._logKext.pkg
- /Library/Caches/AStht_v06.app/Contents/Resources/._phpshell-2.1
- /Library/Caches/AStht_v06.app/Contents/Resources/._Vine Server.app
- /Library/Caches/AStht_v06.app/Contents/Resources/applet.icns
- /Library/Caches/AStht_v06.app/Contents/Resources/applet.rsrc
- /Library/Caches/AStht_v06.app/Contents/Resources/com.AStht.config.plist
- /Library/Caches/AStht_v06.app/Contents/Resources/description.rtfd
- /Library/Caches/AStht_v06.app/Contents/Resources/description.rtfd/TXT.rtf
- /Library/Caches/AStht_v06.app/Contents/Resources/MachEx
- /Library/Caches/AStht_v06.app/Contents/Resources/Scripts/main.scpt
It then drops files relating to the following applications on to the computer:
- logKext
- Vine Server
- phpshell-2.1
- isightcapture
Then it adds itself to the following folder, so that it executes every time the compromised computer starts:
/Library/Preferences/com.apple.SystemLoginItems.plist
It also attempts to add itself to the list of items that open at login:
~/Library/Preferences/loginwindow.plist
Next, the Trojan disables the scheduled update that checks for the current user by modifying Software Update.
Next, the Trojan modifies Software Update in order to disable automatic scheduled updates.
It then lowers security settings by attempting to stop antivirus software from getting updates.
The Trojan attempts to bruteforce the following information from local system accounts:
- User names and their associated passwords
- Openfirmware passwords
- Keychain autologin passwords
- Ad-hoc wifi network passwords
- Apple Remote Desktop passwords
It then stores the above information and attempts to send it back to the attacker using a Web mail service.
The Trojan can also create a symbolic link to a fake sudo command named .sudo2 in order to steal user passwords during authentication.
It may also use the following program for keylogging functionalities:
LogKext
The Trojan may then capture pictures through the iSight camera by using the following program:
iSightCapture
It may also install a PHP shell and Vine Server application for VNC connections.
The Trojan displays the following dialog box to prompt the user to enter their password in order to steal the information:
Title:
Software Update requires your password.
Message:
A corrupt preference file has been detected and must be repaired. Enter yourpassword to continue:
RecommendationsSymantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
- Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack. If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
- If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
- Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
- Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
- Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
- Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
- Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
For successful remove AplS.Saprilt.B virus,you may also need do as following:
1.Please Download Google recommend safer browser Web browser, For more safe , Stay Secure on the Web and stay far away virus,Download URL http://www.antiviruses123.com/firefox/firefox.htm;
2. Temporarily Disable System Restore .
3. Update the virus definitions. Reboot computer in SafeMode;
4.Please download ATF Cleaner: IF you can not remove AplS.Saprilt.B virus successfully,you may seek help on Free Virus Remove Help forum URL:http://help.antiviruses123.com.Our anti virus experts will help you handle AplS.Saprilt.B virus:
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