CoreBot Trojan Removal and Description - How to, Technology and PC Security Forum |

CoreBot Trojan Removal and Description

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TypeTrojan Stealer and Downloader
Short DescriptionSteals all types of credentials – login details, financial information, files, etc.
SymptomsAppearing of different objects in various user folders or the Desktop or on startup. Files encoded with unfamiliar extensions
Distribution MethodSpam mails. MiTM attacks, malicious redirects.
Detection toolDownload SpyHunter, to See If Your System Has Been Affected By CoreBot

ransomwareA dangerous malware infection has been detected out in the wild. It is called CoreBot, and it can cause a lot of havoc and headaches to many users. It is focused mainly on stealing information without any restrictions what so ever. According to IBM’s report this Trojan infects computers mainly via dropper, immediately attacking svchost.exe, a critical Windows process. More to it than that, this RAT (Remote Access Tool) is created in a particular method, allowing it to stay undetected while inputting new methods of data theft from the victim computer. IBM Security X-Force researchers report that the threat name is well concealed, and the most antivirus programs report is as Dynamer!ac or some other similar threats.

CoreBot – Methods of Infection

Malware such as CoreBot may infect systems via massive spam email campaigns. Also, targeted attacks may be the reason for some infections. Targeted attacks are mainly present where there are organizations or any LANs (Local Area Networks) containing average and vast numbers of devices. A good strategy to infect massive amount of users is by using an approach called spoof mailing. It is easy to complete when you try to trick a user. All you need to know is information about who he corresponds by email with often to mask it. When it comes to infecting organizations, however, the attacker has to be very well informed regarding Microsoft Outlook and other mail programs (Mozilla Thunderbird, etc.), because they have spoof email detection protocols. More to it than that, the attackers have to be connected directly to the server of the organization and be within the local network to be able to send the message locally. Basically in this case many attackers may prefer the ‘hands-on’ approach.

CoreBot – More About Information Stealing Software

Information stealing type of Trojans may vary a lot in their methods of infection, methods of data theft, when they steal, do they choose to create a botnet (zombie networks). Either way, Trojan stealers, like CoreBot sniff out the user PC for email credentials, online account information and all types of financial data. Everything may be transferred to the servers of the attackers, where the information could be manually filtered and prioritized by relevance. A lot of Trojan botnet attackers usually sell any stolen information on underground markets to other users. It is a common practice to sell information taken from organizations to competitors.

As previously mentioned, CoreBot uses a dropper to infiltrate a user system. Once this particular code is put into actions, it immediately activates svchost type of process. This process is used as a backbone and allows malicious files to be recorded on the memory drive of the machine. After the dropper has performed its job, it closes.

The following step for CoreBot is to create a UID (unique identifier). This type of code may be used for the purpose of successfully interacting with Windows Registry Editor.

More to it than that IBM engineers report that this type of threat uses a plugin system that enables it to download .dll files and plugins from the attackers’ control center.

Also, researchers say that despite the ability of CoreBot to steal passwords, it is not able to capture live data from online browsing. It is mainly focused on obtaining stored login information in most famous web browsers. Also, the threat scans for any passwords stored in the computer by various clients, as well as information about online wallets and e-payment data.

The malware also has a very specific algorithm, allowing it to communicate safely with the control server via automatically created custom domain names. These particular names are created with the purpose only to be known to the attacker, and it takes an experienced specialist to reverse engineer and discover them. This type of communication is excellent for botnets, and those domain names may or may not change to remain undetected over time. A very interesting discovery, regarding DGA (Domain Generation Algorithm), was that, in this case, the malware creates a domain based on the device’s location.

What is scary for this particular threat is that CoreBot may use the Windows Power Shell to download other malware, such as ransomware (CryptoWall, Bitcrypt, etc.), other trojans, rootkits, keyloggers and more malware on the infected computer.

CoreBot is especially risky to organisations, because if it infects an essential equipment, storing all of the valuable information, can gain access to and steal critical employee data. What is worse, CoreBot can obtain customer information, such as the case of the recent Ashley Madison’s customer information publishing.

CoreBot – How To Remove and Protect Yourself?

In order to prevent such threats from penetrating your defenses, standard protection protocols may not be effective against CryptoBot. You need to use unusual methods of data distribution within your company, such as storing the data offline and keeping it in safe machines that do not even have network cards. These machines may be turned on only when necessary, and the data distribution to them should always be from a secure memory carrier. This is one way of protecting data, but it is surely not the best one. The most important detail is that no matter where you store your important data, you should not share information about how you store it in which location, because experts know that the biggest percentage of information leaking are because of human error.

Removing CoreBot should be done in offline mode, in order to break any active connections with the command and control servers of the attackers. It is recommended to follow the tutorial below to boot into safe mode and from there perform the usual anti-malware scan with such program. Also, since CoreBot has the explicit ability to download other malware onto machines, it is very much recommended to scan the computer for a Rootkit virus with a rootkit remover type of software. Rootkits are not a very common threat but if a cybercriminal wants to remain persistent in the user PC.

1. Start Your PC in Safe Mode to Remove CoreBot.

For Windows XP, Vista, 7 systems:

1. Remove all CDs and DVDs, and then Restart your PC from the “Start” menu.
2. Select one of the two options provided below:

For PCs with a single operating system: Press “F8” repeatedly after the first boot screen shows up during the restart of your computer. In case the Windows logo appears on the screen, you have to repeat the same task again.


For PCs with multiple operating systems: Тhe arrow keys will help you select the operating system you prefer to start in Safe Mode. Press “F8” just as described for a single operating system.


3. As the “Advanced Boot Options” screen appears, select the Safe Mode option you want using the arrow keys. As you make your selection, press “Enter“.

4. Log on to your computer using your administrator account


While your computer is in Safe Mode, the words “Safe Mode” will appear in all four corners of your screen.

For Windows 8, 8.1 and 10 systems:
Step 1: Open the Start Menu
Windows-10-0 (1)
Step 2: Whilst holding down Shift button, click on Power and then click on Restart.
Step 3: After reboot, the aftermentioned menu will appear. From there you should choose Troubleshoot.
Step 4: You will see the Troubleshoot menu. From this menu you can choose Advanced Options.
Windows-10-2 (1)
Step 5: After the Advanced Options menu appears, click on Startup Settings.
Windows-10-3 (1)
Step 6: Click on Restart.
Windows-10-5 (1)
Step 7: A menu will appear upon reboot. You should choose Safe Mode by pressing its corresponding number and the machine will restart.

2. Remove CoreBot automatically by downloading an advanced anti-malware program.

To clean your computer you must download an updated anti-malware program on a safe PC and then install it on the affected computer in offline mode. After that you should boot into safe mode and scan your computer to remove all CoreBot associated objec


Berta Bilbao

Berta is a dedicated malware researcher, dreaming for a more secure cyber space. Her fascination with IT security began a few years ago when a malware locked her out of her own computer.

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