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Remove CrescentCore (Improved Instructions) - Virus Removal Guide

removal by Olivia Morelli - - | Type: Mac viruses

CrescentCore – a malware form that overruns security software on Mac machines

CrescentCore Trojan horse
CrescentCore is a Trojan virus that can relate to the installation of rogue security software

CrescentCore, also known as OSX/CrescentCore is a Trojan horse designed to infect Mac computers by avoiding antivirus detection. This dangerous threat is capable of secretly hiding inside a .dmg disk image and pretends to be a fake update of the Adobe Flash Player tool.[1] First discovered by Intego, CrescentCore virus appears to be a highly-advanced threat that can avoid being spotted even by highly-experienced specialists. Nevertheless, this type of malware aims to inject other programs into the system if the infected OS is not activated on a virtual machine and if no third-party security tools are enabled.

Name CrescentCore, OSX/CrescentCore
Type Trojan horse/Mac malware
Discoverer Intego
Appears as Fake Adobe Flash Player update
Target Mac systems that are not running on virtual machines and have no strong security
Related objects LaunchAgent
Distribution Malicious websites, infected hyperlinks, fake Adobe Flash Player updates
System scanning tools Use Reimage to perform a full system scan and find malware signs

The infection process of CrescentCore malware, similar to OSX/Shlayer, begins when the victim clicks on the disk image icon and enters the fake Flash Player application. However, the threat takes some certain precautionary measures and identifies if it is not a virtual machine that it is running on. If not, malicious activities successfully continue.

Such a precaution step is taken by CrescentCore to ensure that the cybercriminals do not damage their own systems during the infective period. Nevertheless, the Trojan virus needs to ensure that no antivirus protection is running on the infected system and if the malware finds out that it is working on a virtual machine or there is anti-malware on the system, it immediately stops the infections process and deletes itself from the computer/laptop.

If you are a Mac user who has always been concerned about automatical system protection, we can congratulate you as OSX.CrescentCore should not appear on your computer. However, if your machine lacks required security, the risk of getting infected with this Trojan horse might not be that small as you expect it to be.

CrescentCore malware
CrescentCore is a notorious malware form designed to overrun automatical system protection

If CrescentCore finds all conditions satisfying, it continues malicious actions by installing another component known as LaunchAgent.[2] Talking about what it does after such installation, cybersecurity researchers do not have one true answer. However, the Trojan horse might relate in the injection of suspicious security tools such as Advanced Mac Cleaner, Mac Tonic, Mac Mechanic, Auto Mac Speedup, and similar.

Besides, security experts think that the new malware strain might be capable of injecting a malicious “helper object” (e.g. extension) into the Safari web browser application. This type of activity can lead to anywhere. CrescentCore and LaunchAgent might start spying on your personal information or credentials for misusing them in the future. 

If you have discovered this notorious malware on your Mac computer system, you should be careful with it and opt for CrescentCore removal right away. Note that trojan infections might relate to high CPU work, injection of other malicious programs, corruption of software or files, collection of personal data/credentials.[3]

CrescentCore virus

You should not try to remove CrescentCore by yourself as manual activities might relate to more damage than you think it could. Our suggestion would be to scan the entire system with a strong antivirus program such as Reimage to identify all malware strains. Once you find their directories, clean these locations with reputable software entirely.

Distribution tactics of dangerous malware such as Trojan virus

Security experts from NoVirus.uk[4] claim that dangerous infections often choose unprotected sources to be placed in. These pages are easy to enter and due to the lack of protection they provide, potential victims are also very easy to catch here. If you like entering third-party video-watching, gambling, adult-themed, or piracy[5] websites, you have a big risk of ending with notorious malware on your computer system.

The second way of distributing notorious viruses is by using fake Adobe Flash Player updates. Messages which claim that updates are needed for the Player app often appear to be very legitimate-looking and aim to trick a big number of users. However, we want to warn users not to fall for such tricks, especially, if you are using Google Chrome. This browser updates its in-built Player automatically and no manual updates are ever needed.

Malware might also be pushed through email spam campaigns and come injected into normally-looking attachments which are the main carriers of the malicious payload. Be aware of messages that include numerous grammar mistakes, come from an unrecognizable sender. All attachments (even legitimate-looking ones) need to be put under a scan of anti-malware software for full identification.

Automatical removal for disabling CrescentCore 

CrescentCore removal process is not a thing you should postpone or not pay attention to. Most important, DO NOT try to get rid of this malware by yourself if you lack skills in this field. However, if you believe that you are a well-experienced user and have found some signs of infection on your computer, what you can do by yourself is disabling malicious processes if some are found in your Mac machine:

  • Go to Launchpad and type in “Activity Monitor”.
  • Open the application and go to the Processes tab.
  • Find all suspicious processes and press the X button to quit them.

Once you have done this, you can also search for malicious strings related to CrescentCore malware in your Mac login items. If you have found some, you can delete them with the help of these guiding steps:

  • Locate the Apple menu and continue with System Preferences.
  • Press on the Users & Groups sector.
  • Ensure that your username is picked in the left side.
  • After that, find all suspicious login components in the Login Items tab.
  • Use the minus (-) sign to eliminate them.

However, our suggestion would still be to use reputable anti-malware programs such as Reimage, SpyHunter 5Combo Cleaner, Malwarebytes for detecting all components related to this Trojan virus. Furthermore, if you choose a trustworthy repair tool, you will able to remove CrescentCore from all directories of your machine, reverse all suspicious modifications, and optimize the enter system. Also, you can keep the antivirus protection on your computer/laptop for future safety purposes.

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Compatible with Microsoft Windows Supported versions Compatible with OS X Supported versions
What to do if failed?
If you failed to remove virus damage using Reimage, submit a question to our support team and provide as much details as possible.
Reimage is recommended to remove virus damage. Free scanner allows you to check whether your PC is infected or not. If you need to remove malware, you have to purchase the licensed version of Reimage malware removal tool.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with SpyHunter 5.
Alternative Software
Different security software includes different virus database. If you didn’t succeed in finding malware with Reimage, try running alternative scan with Combo Cleaner.

About the author

Olivia Morelli
Olivia Morelli - Ransomware analyst

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