Efsui.exe process is related to a malevolent application that can properly be defined as a coin miner trojan. That malware form uses your hardware to mine cryptocurrencies, primarily – Monero or DarkCoin1. It makes your computer almost unusable due to high CPU usage.
What is Efsui.exe process?
Efsui.exe is a malicious process created by coin miner virus
Efsui.exe – Extremely high CPU as well as GPU usage
Besides CPU usage, some of the coin miners additionally use GPU power for their tasks. In that situation, you will likely struggle even to see the mouse cursor moving – GPU is often utilized on 100%. It is not as critical as processor for system work, so Efsui.exe coin miner viruses do not waste time on trifles and utilize it all. It often may cause unhappy effects.
Shortly about cryptocurrency mining
List of the typical coin miner symptoms
How dangerous is the Efsui.exe miner?
Coin miners does not deal damage to your files. However, they make a lot of unpleasant things with the whole system
Initially, Efsui.exe virus makes your computer overloaded. It is unable to run your applications now, as all processor power is used by a virus. That malware does not care for your necessities, all it focuses on is making money on you. Even if you are patient, and you waited until browser is open, you will likely experience exceptionally sluggish performance. Pages can open for years, any kind of logins will likely take about a minute – just a horror story for a person that works online.
Efsui.exe Technical Summary.
| File Name | Efsui.exe |
| Type | Trojan Coin Miner |
| Detection Name | Trojan:Win32/CoinMiner |
| Distribution Method | Software bundling, Intrusive advertisement, redirects to shady sites etc. |
| Similar behavior | Dhcpsvchostdllcommon.exe, Microsoftconhost.exe, Temp.working |
| Removal | Download and install GridinSoft Anti-Malware for automatic Efsui.exe removal. |
“Visible” damage is not a single bad activity coin miners do to your PC. Efsui.exe coin miner additionally deals damage to your operating system. To conduct all malicious operations properly, it wrecks the security mechanisms of your system. You will likely see your Microsoft Defender disabled – malware halts it to prevent detection. If you open the HOSTS file, you will likely see a ton of new entries – they are brought in by this coin miner to connect your PC to a malicious mining network. All these changes shall be reverted to the initial state in the process of computer recovery.
Hardware effects of coin miner activity
Besides slowing down your computer, performing at peak power for a long period of time may trigger damage to your machine as well as increase power bills. Hardware components are created to easily deal with high load, but they are good with it only in case when they are in a good shape.
Little and covered processor cooling system is not very easy to broke. Meanwhile, GPUs have big and easy-to-access fans, which can be easily broke if touched while spinning, for instance, by the user much before the malware injection. Malfunctioning cooling system, together with the very high load caused by Efsui.exe can easily lead to graphic card failure3. Graphic cards are also tend to have fast wearing when used for crypto mining. It is surely an undesirable situation when your GPU’s performance decreases on 20-30% just after 1-2 weeks of being exploited in such a way.
How did I get Efsui.exe coin miner virus?
Coin miners are spread through different ways, but their main sources are malicious banners and programs from dubious sources
The example of malicious banners you can see in the Internet
One more way you could get this item on your PC is by downloading it from the unreliable website as a part of a program. People who spread hacked versions of popular programs (which do not demand the license key) have small chances to get paid. For this reason, there is a very big lure to add in malware to the final package of the hacked application and get a coin for each setup. Before criticizing these people for hacking and also malware spreading, ask yourself – is it OK to avoid paying for the program in this manner? It is more affordable to pay $20-$30 one time than to pay a much bigger sum for antivirus program and new parts for your computer.
How to remove the Efsui.exe miner from my PC?
The best way to get rid of this coin miner virus is to use anti-malware software
Booting the PC into Safe Mode with Networking
Press the Start button, then choose Power, and click on Reboot while holding the Shift key on the keyboard.
Windows will reboot into recovery mode. In that mode, choose Troubleshoot→ Startup Settings→ Safe Mode with Networking. Press the corresponding button on your keyboard to choose that option.
When your system is in Safe Mode, all third-party apps, along with the majority of non-crucial system components, are not started with the system start. That allows you to clean the PC without dealing with high processor usage of the coin miner.
References
- Read about why Monero and DarkCoin are so popular amongst cybercriminals.
- About unwanted effects for GPUs in the process of cryptomining.
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