RedStar ransomware represents a serious file-encrypting threat that locks victims out of their personal documents, photos, databases, and other valuable files by applying strong encryption algorithms. Once this malware infiltrates a system, it systematically scans for target file types and encrypts them, making them completely inaccessible without the decryption key held by the attackers. Victims typically discover the infection when they attempt to open familiar files and find them renamed with unusual extensions and rendered unreadable.
Like most modern ransomware families, RedStar follows the proven criminal business model: encrypt first, then demand payment in cryptocurrency (usually Bitcoin) in exchange for the decryption tool. The ransom note appears on the desktop and in affected folders, often with aggressive deadlines and threats to permanently delete the decryption key if payment isn't made quickly. Unfortunately, paying the ransom offers no guarantee of file recovery and directly funds criminal operations.
Threat Profile
| Attribute | Details |
|---|---|
| Family | RedStar ransomware family |
| Aliases | Varies by detection vendor; may appear as Ransom:Win32/RedStar, Trojan-Ransom.Win32.RedStar, or similar |
| Platform | Windows (all recent versions vulnerable) |
| Discovered | Active variant observed in circulation |
| Distribution Methods | Malicious email attachments, exploit kits, compromised RDP connections, bundled with pirated software |
| Encryption Algorithm | Likely AES-256 or RSA combination (typical for this class) |
| File Extension Added | Varies by variant; commonly appends unique extension to encrypted files |
| Ransom Note Filename | Varies (often READ_ME.txt, HOW_TO_DECRYPT.html, or similar) |
| Persistence Mechanism | Registry Run keys, scheduled tasks (ensures execution on reboot) |
| Targeted File Types | Documents (.doc, .docx, .pdf, .xls), images (.jpg, .png, .psd), databases (.sql, .mdb), archives (.zip, .rar), and 100+ other extensions |
| Network Behavior | Contacts command-and-control servers for encryption key generation; may attempt lateral movement on networks |
| Removal Difficulty | Moderate (removing the malware itself is straightforward; recovering encrypted files without backups is the real challenge) |
How It Spreads
RedStar ransomware reaches victims through multiple distribution channels, with email-based attacks remaining the most common entry point. Attackers craft convincing phishing messages that appear to come from shipping companies, financial institutions, government agencies, or business partners. These emails contain infected attachments—often disguised as invoices, shipping notifications, or urgent documents—that execute the ransomware payload when opened. Some campaigns use macro-enabled Microsoft Office documents that prompt users to "enable content" or "enable editing," which triggers the malicious code.
Beyond email, RedStar has been observed spreading through compromised websites hosting exploit kits that target unpatched browser vulnerabilities, weak Remote Desktop Protocol (RDP) configurations that allow brute-force attacks, and software piracy channels where the ransomware is bundled with cracked applications or key generators. In business environments, the malware can spread laterally across networks once it gains an initial foothold, particularly when accounts with administrative privileges are compromised.
Common infection vectors include:
- Phishing email attachments — ZIP archives containing executable files, macro-laden Office documents, or PDF files with embedded exploits
- Malicious links — Emails or social media messages directing to download sites hosting the ransomware disguised as legitimate software
- Exploit kits — Drive-by downloads from compromised websites that exploit outdated browser plugins (Flash, Java, Silverlight) or browser vulnerabilities
- RDP brute-force attacks — Automated tools scanning for internet-exposed Remote Desktop connections with weak passwords
- Pirated software bundles — Trojanized cracks, keygens, or "free" versions of paid software downloaded from untrusted sources
- Malvertising — Malicious advertisements on legitimate websites that redirect to exploit kit landing pages
- USB and removable media — Infected flash drives that auto-execute when connected to a Windows machine with AutoRun enabled
What It Does On Your Machine
Once executed, RedStar ransomware works quickly to establish persistence and begin its encryption routine. The malware typically drops its main executable into a user-accessible directory and creates registry entries or scheduled tasks to ensure it survives system reboots. During the initial execution phase, it may temporarily disable Windows Defender or other security software by manipulating their configuration settings or exploiting vulnerabilities in their protection mechanisms.
The encryption process itself is methodical and destructive. RedStar scans all accessible drives—local hard drives, mapped network shares, and connected removable storage—searching for files matching its target list. This list typically includes hundreds of file extensions associated with valuable personal and business data: documents, spreadsheets, presentations, databases, source code, photos, videos, email archives, and backups. For each targeted file, the ransomware applies strong encryption that renders the file completely unreadable without the corresponding decryption key. The malware often appends a unique extension to encrypted files and may rename them entirely, making it immediately obvious which files have been affected.
After encryption completes, RedStar deploys its ransom note—usually multiple copies placed on the desktop and in every folder containing encrypted files. This note explains what has happened, provides instructions for purchasing Bitcoin (if the victim isn't already familiar with cryptocurrency), and includes a payment address along with a unique victim identifier. The note typically features urgent language designed to create panic: threats that the decryption key will be permanently deleted after a deadline expires, warnings against attempting file recovery (which might damage files further), and sometimes even a "customer service" contact method through encrypted messaging platforms.
Some RedStar variants include additional malicious behaviors beyond file encryption. They may delete Windows Shadow Copies (the restore points Windows creates automatically) to prevent easy file recovery, modify Windows boot configuration to make recovery mode harder to access, or exfiltrate certain file types to the attacker's servers before encrypting them—enabling a double-extortion scheme where attackers threaten to publish stolen data if the ransom isn't paid. The malware may also harvest system information, installed software lists, and network configuration details to send back to its operators.
Manual Removal — Step by Step
Immediately Isolate the Infected System
Disconnect the computer from all networks—unplug the ethernet cable and disable Wi-Fi. Turn off any network-attached storage devices and disconnect all USB drives, external hard drives, and other removable media. This prevents the ransomware from spreading to other machines on your network or encrypting additional backup devices. Leave the computer powered on for now; shutting down might trigger additional malicious actions or complicate forensic analysis.
Document the Infection
Before making changes, take photos of any ransom notes displayed on screen, note the file extensions added to encrypted files, and write down the approximate time you discovered the infection. This information can be valuable for identifying the specific ransomware variant and determining whether free decryption tools exist. Check reputable sources like the No More Ransom Project to see if a decryptor has been released for RedStar.
Boot Into Safe Mode with Networking
Restart the computer and repeatedly press F8 (or Shift+F8 on some systems) during boot to access the Advanced Boot Options menu. Select "Safe Mode with Networking" and press Enter. This loads Windows with minimal drivers and services, preventing most malware from launching automatically while still allowing internet access for downloading removal tools. On Windows 10/11, you may need to use the Settings > Update & Security > Recovery method to access advanced startup options.
Identify and Terminate Malicious Processes
Open Task Manager (Ctrl+Shift+Esc) and look for suspicious processes—unfamiliar executables with random names, processes consuming significant CPU resources, or executables running from temporary folders like %TEMP% or %APPDATA%. Right-click any suspicious process, select "Open file location" to note the path, then select "End task." Be cautious not to terminate legitimate Windows processes; when in doubt, research the process name online before ending it.
Remove Persistence Mechanisms
Press Win+R, type "msconfig" and press Enter. Navigate to the Startup tab (on Windows 10/11, this opens Task Manager's Startup section) and disable any suspicious entries. Then open Registry Editor (Win+R, type "regedit") and navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run and RunOnce keys. Look for recently added entries pointing to executables in temporary locations or with random names, note their paths, and delete those entries. Also check Task Scheduler (taskschd.msc) for suspicious scheduled tasks and delete them.
Delete Malware Files and Folders
Navigate to the file locations you identified earlier and delete the malware executable and any associated folders. Common locations include %APPDATA%\Microsoft\Windows\, %LOCALAPPDATA%\, and %TEMP%. Enable viewing of hidden files and folders (File Explorer > View > Options > View tab > Show hidden files) to ensure you can see everything. Delete the ransom note files from your desktop and any folders where they appear, though this is cosmetic—the important part is removing the executable itself.
Scan with Reputable Anti-Malware Tools
Download and install a reputable anti-malware scanner like Malwarebytes (the free version works fine for one-time scans). Run a complete system scan to catch any remnants or additional malware that may have been installed alongside RedStar. Many ransomware infections come bundled with trojans, keyloggers, or cryptocurrency miners. Follow the scanner's recommendations to quarantine or remove all detected threats. Consider running a second scan with a different tool like Emsisoft Emergency Kit for confirmation.
Check for Shadow Copy Deletion and Restore Options
Open an elevated Command Prompt (search for "cmd," right-click, select "Run as administrator") and type "vssadmin list shadows" to see if any Volume Shadow Copies survived. If any exist, you may be able to restore individual files using Previous Versions (right-click a folder > Properties > Previous Versions). Unfortunately, most ransomware variants delete shadow copies, but it's worth checking. If you have external backups made before the infection, now is the time to assess them—but verify they aren't infected before connecting them.
Change All Passwords from a Clean Device
Ransomware infections often include credential-stealing components that capture passwords before encryption begins. Using a different, known-clean computer or mobile device, change passwords for all important accounts: email, banking, cloud storage, social media, and work-related systems. Enable two-factor authentication wherever possible. Do not change passwords from the infected machine until you're absolutely certain it's been thoroughly cleaned and the ransomware is completely removed.
Reboot Normally and Verify Removal
Restart the computer normally (not in Safe Mode) and monitor its behavior for several hours. Check Task Manager for suspicious processes, verify that your security software is functioning properly, and ensure no new files are being encrypted. Run another full anti-malware scan to confirm the system is clean. If everything appears normal—no unusual CPU activity, no new encryption occurring, no suspicious network connections—the malware has likely been successfully removed. However, remember that removal doesn't decrypt your files; you'll need backups or a decryption tool for that.
Prevention
- Implement a comprehensive backup strategy. Maintain multiple backups of important files following the 3-2-1 rule: three copies of your data, on two different types of media, with one copy stored offsite or in cloud storage. Critically, keep at least one backup completely offline (disconnected from your computer) so ransomware cannot access it. Test your backups regularly to ensure they actually work when needed.
- Keep all software updated and patched. Enable automatic updates for Windows, browsers, and all installed applications. Ransomware frequently exploits known vulnerabilities in outdated software. Remove unnecessary programs, especially obsolete browser plugins like Java, Flash, and Silverlight that are common attack vectors. Apply security patches as soon as they're released, particularly for Microsoft Office and Adobe products.
- Exercise extreme caution with email attachments and links. Never open attachments from unknown senders, and be skeptical even of expected attachments from known contacts—their accounts might be compromised. Hover over links to preview URLs before clicking. Be especially wary of Office documents that prompt you to "enable macros" or "enable editing"—legitimate businesses rarely send such files. When in doubt, contact the supposed sender through a different communication channel to verify authenticity.
- Use robust, updated security software. Install reputable antivirus software with real-time protection and keep it updated. Enable Windows Defender if you don't have third-party security software—it's significantly better than nothing. Consider adding anti-exploit software like Malwarebytes Premium that can block ransomware behavior even when signatures aren't available. Configure your firewall properly and consider using a DNS-based filtering service to block malicious domains.
- Restrict user account privileges. Don't use an administrator account for daily activities. Create a standard user account for routine tasks like browsing and email. Ransomware that infects a limited-privilege account causes less damage than one with administrative access. In business environments, implement the principle of least privilege—users should only have access to resources they absolutely need.
- Disable Remote Desktop Protocol or secure it properly. If you don't need RDP, disable it completely. If you must use it, never expose it directly to the internet—use a VPN instead. Require complex passwords, enable Network Level Authentication, implement account lockout policies after failed login attempts, and change the default port 3389 to something non-standard. Consider using two-factor authentication for RDP connections.
- Show file extensions and educate yourself about dangerous file types. Configure Windows to display full file extensions (File Explorer > View > Options > View tab > uncheck "Hide extensions for known file types"). This helps you spot suspicious files like "invoice.pdf.exe" masquerading as PDFs. Be especially cautious of executable files (.exe, .scr, .com, .bat, .vbs, .js) and Office documents with macros enabled (.docm, .xlsm).
- Implement application whitelisting in high-security environments. For business networks or home users with technical capability, configure Windows to only allow approved applications to run. This prevents ransomware executables from launching even if they reach the machine. Tools like Windows AppLocker or third-party application control solutions add significant protection but require initial configuration and ongoing maintenance.
Bring It In
Ransomware removal presents unique challenges that go beyond typical malware infections. While removing the malicious software itself follows a relatively standard process, recovering your encrypted files without backups often proves impossible without paying the ransom—and even payment doesn't guarantee recovery. The criminals might not provide working decryption tools, they might demand additional payments, or they might simply disappear after receiving payment. At Computer Repair Roswell, we've handled hundreds of ransomware cases and can quickly determine whether your specific variant has a free decryption tool available, whether your shadow copies survived, and what realistic recovery options exist for your situation.
Don't let ransomware hold your files hostage any longer than necessary. Bring your infected computer to our Roswell shop at 1335 Hembree Road, or call us at (770) 667-9487 to discuss your situation. We offer free diagnostics to assess the damage and provide honest recommendations—whether that's professional removal and recovery attempts, restoration from your backups, or in the worst cases, a frank assessment that paying the ransom might be your only option (though we never recommend this without exhausting all alternatives first). Our experienced technicians will work efficiently to remove the infection, help you recover whatever files possible, and implement protective measures to prevent reinfection. We understand the stress and frustration ransomware causes, and we're here to help you through this situation with technical expertise and straightforward advice.