Posted: October 22, 2012

PE_MUSTAN.A Description

PE_MUSTAN.A is a virus that attacks your computer's anti-virus programs, spreads through networks, infects wide ranges of files and attempts to connect to a remote server for instructions on additional attacks. While malware research team has seen signs of PE_MUSTAN.A being a potential update to the WORM_MORTO.SM worm or at least a program designed by the same team of coders, PE_MUSTAN.A is more than dangerous enough by itself and can potentially allow criminals to control your computer via backdoor-based attacks. Since PE_MUSTAN.A avoids infecting files that would cause obvious system crashes and other types of misbehavior, you may not see symptoms of a PE_MUSTAN.A infection. Whenever available, anti-malware programs always should be used to delete PC threats that, like PE_MUSTAN.A, infect other files habitually.

PE_MUSTAN.A: Hammering Home the Importance of a Strong Password to Your Detriment

PE_MUSTAN.A often is identified as a member of the Morto family due to employing the same brute-force method of breaking into password-protected PCs and accounts that Morto-based PC threats are known to use. PE_MUSTAN.A tests a range of common phrases for both the admin field and the password field, and, if successful, can infect the protected computer (as well as stealing the login information). Although the following list isn't conclusive, malware researchers listed some of the most common combinations that PE_MUSTAN.A uses:

  • For the user name, PE_MUSTAN.A uses such phrases as:

    – admin
    – administrator
    – test
    – user

  • For the password, PE_MUSTAN.A may use:

    – 12345
    – login
    – password
    – user123
    – 123abc
    – owner
    – tigger
    – foobar
    – computer

This only is a small list of the potential passwords and user names that PE_MUSTAN.A may use in various combinations. Similar tactics have been used by members of the Morto family like WORM_MORTO.SM, and PE_MUSTAN.A, itself, often is detected by the alias of Worm:Win32/Morto.A. PE_MUSTAN.A uses this attack in conjunction with attempts to spread through removable devices (such as USB drives) and network shares, which allows PE_MUSTAN.A to infect networks and device-sharing computers easily – provided that they lack secure account passwords.

What PE_MUSTAN.A's Little File Additions Do to Wreck Up Your PC

As a virus, PE_MUSTAN.A can infect almost any type of EXE or executable file on your computer. PE_MUSTAN.A whitelists (prevents itself from infecting) specific files in locations that are central to the Windows OS, along with some common instant messengers and web browsers – most likely to avoid detection or serious system malfunctions. However, even with these restrictions, PE_MUSTAN.A is capable of being a danger to your PC by allowing criminals to control it through a remote server or use PE_MUSTAN.A to install other PC threats. malware experts also have observed PE_MUSTAN.A deleting Registry entries for common anti-virus programs, which causes the associated applications to be inoperable. If you're unable to restore your Registry from a backup, you may be required to reinstall the programs that are affected by PE_MUSTAN.A's attack.

As a file infector that's confirmed to spread through networks and removable devices, PE_MUSTAN.A should be contained so that PE_MUSTAN.A can't spread to associated PCs quickly. malware researchers stress the usefulness of anti-malware software and strong password security for this purpose. PE_MUSTAN.A can be deleted from infected files, without harming the files in question, by using suitable anti-virus products.

Use SpyHunter to Detect and Remove PC Threats

If you are concerned that malware or PC threats similar to PE_MUSTAN.A may have infected your computer, we recommend you start an in-depth system scan with SpyHunter. SpyHunter is an advanced malware protection and remediation application that offers subscribers a comprehensive method for protecting PCs from malware, in addition to providing one-on-one technical support service.

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Note: SpyHunter's free version is only for malware detection. If SpyHunter detects malware on your PC, you will need to purchase SpyHunter's malware tool to remove the malware threats. Learn more on SpyHunter. If you would like to uninstall SpyHunter for any reason, please follow these uninstall instructions. To learn more about our policies and practices, visit our EULA, Privacy Policy and Threat Assessment Criteria.

Why can't I open any program including SpyHunter? You may have a malware file running in memory that kills any programs that you try to launch on your PC. Tip: Download SpyHunter from a clean computer, copy it to a USB thumb drive, DVD or CD, then install it on the infected PC and run SpyHunter's malware scanner.

Technical Details

Registry Modifications

The following newly produced Registry Values are:

HKEY..\..\{Value}HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wmicucltsvc ImagePath = "%System%\wmicuclt.exe"HKEY_LOCAL_MACHINE\SYSTEM\Select p = "{login passwords}HKEY_LOCAL_MACHINE\SYSTEM\Select v = "{virus code}"HKEY_LOCAL_MACHINE\SYSTEM\Select ext = "{plugin code obtained from C&C}"HKEY_LOCAL_MACHINE\SYSTEM\Select pu = "{login usernames} - {login passwords}"HKEY_LOCAL_MACHINE\SYSTEM\Select rmt = "{date and time of execution}"HKEY_LOCAL_MACHINE\SYSTEM\Select plg = "{plugin code obtained from C&C}"HKEY_LOCAL_MACHINE\CurrentControlSet\Services {Security Service} = "4"HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\CurrentVersion\Run {AntiVirus Application} = "{Path of AntiVirus Application}"HKEY_LOCAL_MACHINE\SYSTEM\Select {ip address of targeted victims} = {date and time of execution}HKEY..\..\..\..{Subkeys}HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wmicucltsvc

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