Once executed, the Trojan creates the following files:
- /Users/Shared/SC Info/.candidates
- /Users/Shared/SC Info/.accounts
- /Users/Shared/SC Info/.hashes
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
This vulnerability affects OS X 10.4 through 10.4.7.
Next, it may create the following files:
- /Library/Caches/AStht_v06.app/Contents/Resources/._Vine Server.app
It then drops files relating to the following applications on to the computer:
- Vine Server
Then it adds itself to the following folder, so that it executes every time the compromised computer starts:
It also attempts to add itself to the list of items that open at login:
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:
The Trojan may then capture pictures through the iSight camera by using the following program:
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:
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":