Common Signs of a Compromised Network #

Detecting a compromised network early is crucial to prevent further damage and secure sensitive data. Hackers and malicious actors often leave telltale signs that can help businesses identify an attack in its early stages. Recognizing these signs can lead to a quicker response, reducing the potential impact on your organization.

1. Unexpected Spikes in Network Traffic #

One of the most noticeable signs of a compromised network is an unexpected spike in trafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive. If there’s a sudden surge of activity that doesn’t correlate with normal business operations, it could indicate malicious activity.

• Unusual TrafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive Patterns: Check for trafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive spikes during off-hours or outside the regular business workflow.
• Excessive Bandwidth Usage: Unexplained high bandwidth consumption might suggest a Distributed Denial of Service (DDoS) attack or data exfiltration attempts.

Monitoring network trafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive regularly helps detect these anomalies before they escalate into larger issues.

2. Unrecognized Devices on the Network #

If unauthorized devices are found on your network, it is a strong indicator that an intruder may have gained access. These devices could be used to steal data or spread malware throughout the system.

• Device Discovery Tools: Use tools to regularly scan your network for unknown or unrecognized devices.
• Monitor New Connections: Be vigilant about new devices connecting to the network, especially during periods of inactivity.

Ensuring all devices are accounted for can help prevent unauthorized access.

3. Frequent System Crashes or Slowdowns #

Frequent crashes or system slowdowns can also signal a network compromise. Malware and unauthorized access often cause systems to behave erratically, as they interfere with normal operations.

• System Instability: Random crashes or applications freezing may point to a deeper issue, like a virus or malware attack.
• Slow Performance: A network attack could also overwhelm the system, resulting in slow or delayed operations.

Regular system checks and network health assessments are key to detecting these early signs.

4. Unauthorized Changes to Files or Settings #

Malicious actors often modify system files, settings, or configurations as part of a network breach. These changes can leave your network exposed to further attacks.

• File Integrity Monitoring: Use software that tracks changes to critical files and configurations.
• Unexpected Settings Adjustments: Keep an eye out for changes in user access controls, network configurations, or system preferences without proper authorization.

Detecting unauthorized changes quickly can help mitigate risks before they escalate into a full breach.

5. Unexplained System Alerts and Logins #

Unexplained logins or unusual system alerts can also point to a compromised network. If you notice any unauthorized login attempts or security alerts from your systems, it’s vital to investigate immediately.

• Failed Login Attempts: A sudden increase in failed login attempts, especially from unknown locations, is often a sign of a brute-force attack.
• Unexpected Security Alerts: Intrusion detection systems may send alerts if they detect unfamiliar or unauthorized activities within your network.

Prompt response to these alerts helps prevent further unauthorized access.

6. Suspicious Network Traffic from External Sources #

If external sources are communicating with your internal network without prior authorization, this could be a sign of a breach. Hackers often attempt to exfiltrate data or establish persistent connections for future attacks.

• Check for Unknown IP Addresses: Unrecognized external IP addresses communicating with internal systems can be a red flag.
• Outbound TrafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive Monitoring: Monitoring outbound trafficThe number of visitors to a website, categorized as organic, paid, direct, or referral traffic based on how users arrive for unusual activity can help detect data exfiltration attempts.

Maintaining strict outbound communication controls can help secure your data and prevent leaks.

7. Conclusion #

Being vigilant for signs of a compromised network is essential to protect your business. Early detection can help minimize the damage and prevent further attacks. Regular monitoring, system audits, and employee awareness are key to identifying issues before they become significant threats.

For help strengthening your network security and detecting potential threats, email Ikonik Digital at [email protected]. We’re ready to assist you in securing your systems and ensuring the safety of your business.