Updated: February 13, 2007 11:50:05 AM
Also Known As: Mediera, Mierda
Type: Virus


The CPW.1527 virus is a rather simple virus which will infect both .COM and .EXE files of a size greater than 10240 bytes. This virus also specifically searches out and infects the file C:\COMMAND.COM

Antivirus Protection Dates

  • Initial Rapid Release version December 14, 2000
  • Latest Rapid Release version January 05, 2018 revision 021
  • Initial Daily Certified version December 14, 2000
  • Latest Daily Certified version January 06, 2018 revision 001

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Updated: February 13, 2007 11:50:05 AM
Also Known As: Mediera, Mierda
Type: Virus


After loading itself into memory, this virus will spread whenever there is an attempt to load/execute a file, open a file, or change the attributes of a file. During each virus infection check/process, this virus will check the file C:\COMMAND.COM to verify it’s infection status and delete the file CHKLIST.CPS within the current working directory.

There are three specific days that will cause this virus's payload to trigger: May 27 th , September 11th , and December 28th (the virus’s trigger routine will only execute when the clocks hour matches 01).

In all three of the activation routines, the virus searches through the hard drive deleting the first file that match the filename.ext of *.* within the current working directory.

Contained within the body of the virus is the following text in encrypted format:

CPW fue hecho en Chile en 1992, VIVA CHILE MIERDA!

C:\COMMAND.COM

MZ

GUARD guard CPAV SCAN CHKVIRUS CLEAN TOOLKIT VSAFE CHKLIST.CPS

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • 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.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a 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.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. 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.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.