Arcus Ransomware: A Removal Guide

Ransomware is a particularly dangerous type of malware that locks or encrypts files on an infected computer, demanding a ransom in exchange for the decryption key. This form of malware has become a significant threat to individuals and businesses alike, causing severe disruptions and financial losses. Today, we’ll delve into Arcus Ransomware, exploring how it works, the symptoms of infection, and how you can protect yourself from it.

What is Arcus Ransomware?

Arcus Ransomware is a malicious program that belongs to the larger family of ransomware threats known as 'Phobos'. Like other ransomware variants, Arcus encrypts files on the infected system and demands a ransom payment in cryptocurrency to restore access to these files. Once installed, it starts locking a range of files, rendering them inaccessible to the user. The ransomware typically encrypts valuable personal data, such as documents, images, videos, and databases, which can be crucial for both personal users and businesses.

Installation and Functionality of Arcus Ransomware

Arcus Ransomware often spreads through phishing emails, malicious attachments, or unsafe downloads. When a user opens an infected file or clicks on a malicious link, the ransomware is executed. It then installs itself in the system, typically hiding its presence by disguising its files with generic names or in system folders.

We have analyzed Arcus ransomware and identified two distinct variants, one of which is based on the Phobos ransomware. Both variants encrypt files and modify filenames by appending a specific extension, which varies depending on the ransomware version.

The Phobos-based variant renames files by appending the victim's unique ID, an email address, and the ".Arcus" extension to the filenames. For example, a file named "1.jpg" would be renamed to "1.jpg.id[9ECFA84E-3537].[arcustm@proton.me].Arcus," and "2.png" would be renamed to "2.png.id[9ECFA84E-3537].[arcustm@proton.me].Arcus." This variant also drops an "info.txt" ransom note and displays a pop-up window.

The second Arcus variant uses a different naming convention, appending "[Encrypted].Arcus" to the filenames. For instance, "1.jpg" would be renamed to "1.jpg[Encrypted].Arcus." Additionally, this variant drops a ransom note called "Arcus-ReadMe.txt."

Example of File Encryption

Here’s an example of how Arcus Ransomware works:

• Before encryption: photo.jpg
• After encryption: photo.jpg.id[9ECFA84E-3537].[arcustm@proton.me].Arcus

It’s clear from this example that the ransomware appends .arcus to the file extension, making the files unreadable and inaccessible without the decryption key.

The Ransom Note: A Closer Look

After encrypting the files, Arcus Ransomware drops a ransom note that provides instructions for the victim. The note typically includes the following:

1. Demand for Payment: A request for payment in cryptocurrency, often Bitcoin, to obtain the decryption key.
2. Threat of Data Loss: A threat stating that if the victim doesn’t pay the ransom within a specified time, the encrypted files will be permanently deleted.
3. Contact Information: Email addresses or URLs for communication with the attackers, often hidden within a disguised message to avoid detection.

This ransom note serves as the primary communication between the cybercriminals and the victim.

Text in the info.txt file (first variant):

!!! You Have Been Compermized !!!

All Of Your Sensitive Data Encrypted And Downloaded.
In Order to Keep Your Sensitive Data Safe And Decrypt Files You Have to Contact Us.

Mail Us on : arcustm@proton.me or arcusteam@proton.me 
Tox Us on : F6B2E01CFA4D3F2DB75E4EDD07EC28BF793E541A9674C3E6A66E1CDA9D931A1344E321FD2582
LeakBlog : hxxp://arcuufpr5xx*********************************hszmc5g7qdyd.onion

As much as you Contact Faster Your Case Will be resolved Faster.

You Will Be listed In our LeakBlog in Case You Dont Contact in 7 Days .

Text in this ransom note:

Arcus 
You Have Been Compermized
All Of Your Sensitive Data Encrypted And Downloaded
What Happened?
Unfortunately We Have to Let you Know Your Company Targeted By Arcus 
Your Network Has been Compermized and Sensitive Data Downloaded And Encrypted.

What Should You Do ?
In Order to Keep Your Sensitive Data Safe And Decrypt Files You Have to Contact Us 
You Should Pay Small Fee That Will be Negotiated After You Contacted Us 
After Completing Steps Files Will deleted from servers and you will receive Decrypt keys and Program What Happens if You Dont Negotiate?
Your Company Will Be Listed in Our LeakBlog
So Medias Will Spread News About The Hack and You Will Lose Your Reputations
The Data Will be Open For Sale To Everyone After 14 Days
So You Have to Face with GDPR LAW And Customers 
Your Team Should Explain To Customers And Court How they failed Protecting Personal Data
Contacting the police will not save you from these consequences, and lost data, will only make your situation worse. 
Your Sensitive Data Will Leaked all Over Internet At The End

How to Contact Us
Write us to the mails: arcustm@proton.me or arcusteam@proton.me
in Case you did not get Answer in 24 hours or if you Look for Safer way You Can Download Tox Chat And Contact : F6B2E01CFA4D3F2DB75E4EDD07EC28BF793E541A9674C3E6A66E1CDA9D931A1344E321FD2582
Also You might Take Look At Our LeakPage Download TOR Browser and Look For : hxxp://arcuufpr5xx*********************************hszmc5g7qdyd.onion 
As much as you Contact Faster Your Case Will be resolved Faster
We Always Contact You With Proves(Sensitive Files or Ask For Sample Decrypion)
Contact Ways are always updated in Leakpage.

Ransom note generated by the second Arcus variant ("Arcus-ReadMe.txt"):

All Of Your Sensitive Data Encrypted And Downloaded.

In Order to Keep Your Sensitive Data Safe And Recover Files You Have to Contact Us.

Download tox chat : hxxps://tox.chat/download.html
Add And Message Us on  :
F6B2E01CFA4D3F2DB75E4EDD07EC28BF793E541A9674C3E6A66E1CDA9D931A1344E321FD2582
In case No Answer in 24h Mail to : pepe_decryptor@hotmail.com

in case you don't contact in 3 Days You Will Posted In our LeakBlog ,
News about this Hack will ruin your reputation,
After 5 days ALL your Sensitive DATA (Customers Confidential Data, Company Finance, Contracts, etc ..)  will Published into LeakBlog,
you will face with GDPR and your own Customers , The People affected will get mail from us about this hack and how their Confidential Data is not Safe anymore.

You can download TOR browser and take look at our blog :
hxxp://arcuufpr5xx*********************************hszmc5g7qdyd.onion

Don't panic , Your Case will resolved as soon you contact us and you can back to work as before .
We hope you Consider Risk of Data Exposure.

>>> WARNING :
1. DO NOT MODIFY ENCRYPTED DATA YOURSELF OR USE THIRD PARTY , IT MAY DAMAGE DATA AND LEAD TO PERMANENT DATA LOSS .
2. DO NOT STOP ENCRYPTION PROCESS , IT MAY DAMAGE DATA AND LEAD TO PERMANENT DATA LOSS .

Symptoms of Arcus Ransomware Infection

If Arcus Ransomware has infected your computer, you may notice the following symptoms:

• Encrypted Files: Many of your files will have a new, unfamiliar file extension (e.g., .arcus).
• Slow System Performance: Your system may begin to operate more slowly as the ransomware uses system resources to encrypt files.
• Unusual Activity: Files may start disappearing or becoming inaccessible without any apparent cause.
• Ransom Note: A text file or HTML page may appear on your desktop or within your folders, providing ransom instructions.

Detection Names for Arcus Ransomware

If you suspect that Arcus Ransomware is on your system, several antivirus programs may identify it by specific detection names. Common detection names for this ransomware include:

• Arcus Ransomware
• Trojan.Ransom.Agent
• Ransom.Win32.Arcus
• Ransom:Win32/Arcus

Use these names when performing a scan with an antivirus or anti-malware program.

Similar Ransomware Threats

If you’re dealing with ransomware threats, you might also encounter similar malware variants. Some other ransomware strains that operate in a similar manner to Arcus include:

• LockBit Ransomware
• BlackCat Ransomware
• Conti Ransomware
• REvil Ransomware

All of these threats function similarly by encrypting files and demanding ransom payments.

Detailed Removal Guide for Arcus Ransomware

If your system is infected with Arcus Ransomware, it’s critical to act swiftly. Here’s a comprehensive removal guide to help you get rid of the ransomware:

1. Disconnect from the Internet: To prevent further data transmission, immediately disconnect your computer from the internet. This may prevent the ransomware from communicating with its command-and-control server.
2. Enter Safe Mode: Restart your system in Safe Mode to prevent the ransomware from running during the removal process. You can do this by pressing F8 (or Shift + F8 for Windows 10/11) during startup and selecting “Safe Mode with Networking.”
3. Run Anti-Malware Software: Use reliable antivirus software to scan and remove the ransomware. We recommend using SpyHunter, a powerful anti-malware tool, which can detect and remove Arcus Ransomware. You can download it and scan your system for free.
4. Restore from Backup: If you have a backup of your files, now is the time to restore them. Ensure that the backup is free of ransomware before restoring.
5. Delete Temporary Files: Remove any temporary files that could be used by the ransomware to re-establish its presence. Use the Disk Cleanup tool to clear these files.
6. Check for Residual Files: Navigate through system folders (like Program Files and AppData) to check for any remaining ransomware files. Delete these files manually if they exist.
7. Reset System Settings: To be safe, reset any system settings that may have been altered by the ransomware, such as startup configurations.

Preventing Future Infections

To avoid future ransomware infections, follow these preventive measures:

• Keep Software Updated: Regularly update your operating system and software to patch vulnerabilities that ransomware could exploit.
• Use Strong Passwords: Ensure your passwords are unique and difficult to guess. Enable multi-factor authentication where possible.
• Avoid Suspicious Links and Attachments: Be cautious of unsolicited emails or messages with attachments or links. These are common methods used to deliver ransomware.
• Backup Your Files: Regularly back up your important data to an external drive or cloud storage. This ensures that even if your system is compromised, you can recover your files.
• Install Anti-Malware Software: Always use a trusted anti-malware program to scan for and block potential threats. We highly recommend SpyHunter for comprehensive protection.

SpyHunter: Protect Your System

If you’ve encountered Arcus Ransomware or are concerned about future malware attacks, we strongly encourage you to download SpyHunter. It offers a free scan and powerful protection against ransomware and other types of malware. Don’t wait for an attack to happen—be proactive about securing your system.