When securing your IT infrastructure and network, the signs of compromise are all around you. So, how do you know if your system has been compromised? Here are some signs that might indicate a breach:

10 Signs Your System Has Been Compromised:

1. Anomalous Login Failure

When you see many users with failed login attempts, this is a sign that your systems may have been compromised. A sudden increase or decrease in the number of failed login attempts can indicate when an attacker has successfully gained access to your network (or attempted to gain access).

• Look for unusual locations where users are logging in from. Suppose you notice an unusually high rate of failed login attempts from one location or set of locations. In that case, it could indicate that someone is trying to brute force their way into your network by guessing passwords repeatedly until they get lucky enough to guess correctly.
• Look for suspicious times when the user login if you see signs your system has been compromise. If you notice unusual spikes in failed login attempts during off-hours. For example, early morning hours when most people aren’t working on their computers. Then something might be wrong with how those computers are configured, so they allow login slogans without requiring authentication every time they’re turned on (or, even worse, allowing anyone who knows how to find out where these frequently connected devices are located).

2.  Suspicious Privileged Account Activity

Privileged accounts are those that have elevated access to sensitive data. This means they can do more than regular users. They’re often used to execute malicious activity, so you must monitor for suspicious activity from privileged accounts.

Suppose you see unexpected or unusual activity from privileged accounts. In that case, there’s a good chance your IT infrastructure has been compromised and is now being used to launch attacks against other systems or organizations in your network.

3. Suspicious DNS Requests

DNS requests are often used in malware campaigns and can be used to determine the location of a machine, its operating system, and the type of device. DNS requests have been known to get flagged because they look suspicious if .

If you see any unusual DNS traffic on your network, it’s time to check for malware or compromised devices if you see signs that your system has been compromised.

4. Anomalous Registry Changes

One of the easiest ways to infect a computer is through registry changes. This can happen when malware is installed or when you install a legitimate program. If you suspect something has changed in your registry, run a virus scan and check to see if the scanner detected any malware. You should check your firewall logs for suspicious activity if this does not turn up maliciously.

5. Signs Of a Distributed Denial-Of-Service Attack (DDoS)

Distributed denial-of-service (DDoS) attacks can disrupt companies, especially if their websites are targeted. DDoS attacks are on the rise and can target various industries, from financial services to healthcare.

When you suspect your business is under attack by a DDoS attack or other malicious activity, it’s important to take action immediately. These attacks are sometimes difficult for IT teams to determine how long they’ll last or what their impact will be on the network.

6. Suspicious File and Folder Activity

If you notice file or folder activity outside of normal business hours, it can be a sign that your IT infrastructure has been compromised.

Similarly, if you see files or folders being accessed by a device that does not normally access those particular files or folders, this can be another indicator of a breach.

7. Unusual Port Usage

Port scanning is used to identify open ports on a host. This technique aims to determine whether the system has any exploitable vulnerabilities that may allow an attacker to gain access or cause damage. Port scans can be used for reconnaissance, enumeration, and vulnerability testing. A common use case of port scans is performing a simple ping sweep to detect systems connected within a subnet.

8. HTML Response Sizes & Spikes In Database Activity

If you see a spike in database activity, pay attention. This can indicate that something has been done to the website, like injecting extra code or changing its content. Many things can cause a spike in database activity—but if it’s not supposed to be there, it should set off alarm bells for you.

You should also look for unusually large response sizes and spikes in CPU usage if you see a sign that your system has been compromised.

9.Geographical Irregularities

When trying to discern if your network has been compromised, the first thing to look for is geographical irregularities. A hack can cause various anomalies, from geographic jitter to strange latency.

You may also notice that certain ports or IP addresses are being accessed by unknown entities, which would be another sign that your system has been compromised.

10. Suspicious Outbound Traffic

Sometimes, outbound traffic can be normal. If you see a spike in outbound traffic, check if it is normal for your organization. If it is not normal, investigate the source of the traffic and consider blocking the IP address or network that generated it.

If a DDoS attack is hitting you, you should block an entire range of IP addresses instead of trying to determine which one(s) are involved with the attack on your network.

Conclusion

If you’ve done the due diligence to ensure your organization is secure and that your systems are functioning properly, it should be easy to spot any signs your system has been compromise. We recommend contacting a trusted third party for help if you are unsure.