How do I know if I have ransomware?
Updated on October 21, 2022, by Xcitium
How Do I Know If I Have Ransomware?
You can tell if you have ransomware by looking for signs such as locked files, unusual file extensions, ransom messages, or restricted system access. Other indicators include slow performance, high CPU usage, and files that suddenly become inaccessible.
You will know that you have ransomware because it will send you a message letting you know that it is there. You then need to decide what to do about it. With that in mind, here’s a quick guide to dealing with ransomware.
Top Signs You Have Ransomware
Here are the most common warning signs:
- Ransom Note Appears
A message demanding payment to unlock your files is the clearest indicator - Files Are Encrypted or Won’t Open
Documents, images, or databases suddenly become inaccessible - Strange File Extensions
Files renamed with unknown extensions (e.g., .locked, .crypt) - Locked Screen or System Access Denied
You cannot log in or access your desktop (locker ransomware) - Unusual System Slowness or High CPU Usage
Encryption processes consume system resources - Missing or Hidden Files
Files disappear or are moved without your knowledge
Early Warning Signs
Recognizing early signals can help stop ransomware before damage:
- Suspicious emails with attachments or links
- Unexpected pop-ups or software installations
- Antivirus disabled without your action
- Unusual network activity or file changes
👉 Early detection is critical because ransomware spreads quickly once activated
Quick Checklist: Do You Have Ransomware?
Ask yourself:
- Are your files suddenly locked or encrypted?
- Do you see a ransom demand message?
- Are file names or extensions changed?
- Is your system unusually slow or unresponsive?
👉 If you answered yes to any of these, your system may be infected.
What Happens When You Get Ransomware?
Ransomware is malware that encrypts files or locks systems and demands payment to restore access .
Modern attacks may also steal data and threaten to leak it.
What to Do Immediately
- Disconnect from the internet
- Isolate the infected device
- Do NOT pay the ransom
- Run anti-malware or endpoint detection tools
- Restore from backups if available
The basics of ransomware
At present, there are three main kinds of ransomware. These are scareware, lockware, and encryption ransomware.
Scareware and lockware are often overlooked because encryption ransomware is, understandably, seen as the main threat. It is, however, important to remember that they exist as you may need to deal with them. In fact, you may need to deal with scareware (or lockware) pretending to be encryption ransomware.
Scareware just makes your device show a scary message, nothing else. Lockware locks your computer, but the lock is very basic and can be easily bypassed. If you get scareware then all you need to do is install an anti-malware program and have it scan your device. If you get lockware, then you need to boot into safe mode and then install an anti-malware program and have it scan your device. If you can’t do that, then boot into safe mode, restore to a previous time point and then install an anti-malware program and have it scan your device.
Dealing with encryption ransomware
Dealing with the actual infection is generally very straightforward. Usually, all you need to do is install an anti-malware program and have it scan your computer. The problem is that by the time you discover that you’ve been attacked by encryption ransomware, the damage is already done. Your files are encrypted.
If you have a backup, this means that you have to waste time restoring from it while people sit idle. If you don’t have a backup, then you have few options and all of them are unpleasant. You can cross your fingers and hope that there is a working decryption key on the internet. This is possible, but it does take quite a bit of luck as ransomware is regularly updated to keep it ahead of security tools. You can pay the ransom (with all that implies) or you can accept the loss of your files and potentially the theft of your data.
Encryption ransomware and data theft
If your data is stored in the clear (i.e. without encryption) then anyone who can access your production system can probably get access to it. Other security mechanisms, such as passwords, may provide some level of protection, but are unlikely to deter a serious attacker. Two-factor authentication might do so, but even this is vulnerable to compromise, especially if you implement it through smartphone apps rather than security tokens as smartphones (and their numbers) can be taken over by cyberattackers.
Even if you pay the ransom, there is nothing to stop cybercriminals from selling your data to increase their profits. If you refuse to pay the ransom, they may choose to make their money by selling your data or they may choose to expose it online to embarrass you and intimidate potential victims.
Keeping data encrypted, sadly, cannot put a stop to ransomware attacks. The cyberattackers will just encrypt the data again. It can, however, protect you from data theft as a consequence of a ransomware attack.
Preparing for ransomware attacks
As the old saying goes, “hope is not a strategy”. You cannot simply cross your fingers and hope that you will be too small, too big, or too anything for cyberattackers to notice you. You have to assume that you will be targeted with encryption ransomware and prepare accordingly.
This means that, first of all, you need a robust anti-malware program with an integrated firewall. Specifically, you need one from a reputable security company. The default security programs bundled with the main operating systems are highly unlikely to be enough on their own.
Secondly, you need a reliable and effective process for ensuring that your operating systems and locally-installed apps are all updated promptly. If need be, sign a contract with a managed IT services partner to do it for you.
Thirdly, you need to secure the USB ports on your computers (and make sure you need admin privileges to install software via any optical drives).
Fourthly, you need to educate employees on the basics of safe surfing/emailing and what they need to do to protect themselves (and the company) from social engineering.
Fifthly, you need to ensure that you have an off-site data backup which is entirely separate from your main system and ideally you should be able to restore to different time points in case there is a delay in picking up on the attack.
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