Day 12 | Network Forensics: Following the Digital Trail of a Cyberattack

Centre for Police Technology (CPT) presents a 31-Day Cybersecurity Knowledge Series for Police, LEAs, Corporate Investigators, Digital Forensics, Fraud, Cyber Risk and Security Professionals.

October 12, 2026: Every cyberattack leaves potential clues. Suspicious connections, unusual data transfers and communication with malicious servers can help investigators understand how criminals enter networks and move through digital systems.

Day 12 of the Centre for Police Technology (CPT) 31-Day Cybersecurity Knowledge Series explores how investigators trace cybercrime, how criminals exploit networks and how individuals can protect themselves.

What Is Network Forensics?

Network forensics examines communications between devices to identify suspicious or malicious activity.

Investigators may analyse:

• IP addresses: Identifying communicating systems and potential attack infrastructure.
• DNS queries: Investigating domains accessed by devices.
• Network packets: Examining available details of network communications.
• Firewall logs: Reviewing suspicious or blocked connections.
• Traffic records: Identifying unusual communication patterns and data transfers.

Together, these records can help reconstruct the sequence of a cyber incident.

How Do Criminals Exploit Networks?

Cybercriminals use several techniques to compromise devices, steal information and conceal their activities.

Phishing and Credential Theft: Fraudsters send deceptive emails, messages or login links to steal passwords and account credentials.

Malware and Ransomware: Malicious software can communicate with attacker-controlled servers, steal information or encrypt files for ransom.

Public Wi-Fi Attacks: Criminals may exploit poorly secured networks or create deceptive Wi-Fi hotspots to trick users into connecting. The risk is greater when users ignore security warnings or access sensitive services without adequate protection.

Data Exfiltration: After gaining access to a system, attackers may transfer confidential information outside the organisation.

Command-and-Control Communications: Some malware communicates with external servers to receive instructions or transmit stolen data.

Fraudulent Websites: Criminals can use fake banking, shopping or payment websites to capture personal and financial information.

These activities may leave network-level indicators that investigators can correlate with other evidence.

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How Does Network Forensics Help Investigators?

Network forensics helps security teams identify suspicious connections, examine affected devices and establish the possible scope of an attack.

For example, repeated connections to suspicious infrastructure may indicate malware activity, while unusual outbound traffic could warrant investigation for potential data theft.

Investigators correlate network records with endpoint alerts, authentication logs and other evidence to establish a timeline.

An IP address alone does not prove who committed a crime. Attribution requires corroborating evidence and careful analysis.

How Can Ordinary People Protect Themselves?

You do not need to be a cybersecurity expert to stay safer online. A few simple habits can help reduce the risk of network-based cybercrime.

• Think before clicking: Avoid suspicious links and attachments in emails, SMS messages and WhatsApp messages.
• Protect your passwords: Use unique passwords and enable two-factor authentication for important accounts.
• Be careful with public Wi-Fi: Avoid accessing sensitive accounts on unfamiliar networks. Use mobile data when possible.
• Keep devices updated: Install security updates for your phone, computer, apps and browser.
• Watch for warning signs: Unexpected login alerts, unknown apps, unusual data usage or unfamiliar bank transactions may indicate suspicious activity.
• Act quickly if something goes wrong: Change compromised passwords from a trusted device, sign out of unknown sessions and contact your bank if financial information may be at risk.
• Report cybercrime: In India, call 1930 promptly if you experience financial cyber fraud and submit a complaint through the National Cyber Crime Reporting Portal.

If you suspect your device has been compromised, seek help from a trusted technical professional. Avoid deleting potentially relevant messages or files if you may need to report the incident.

How Can Police and LEAs Use Network Forensics?

Police and Law Enforcement Agencies can use network evidence to support investigations involving ransomware, phishing, online financial fraud, unauthorised access and data breaches.

Investigators should preserve relevant logs promptly, document evidence collection, maintain chain of custody and distinguish verified findings from investigative leads.

Network evidence can help establish what happened, but identifying the person responsible may require additional digital, financial and contextual evidence.

How Can Ordinary People Respond to Network-Based Cybercrime?

Individuals do not need specialised forensic tools to take useful protective steps.

• Avoid suspicious links: Do not enter passwords or banking details through unexpected messages.
• Secure accounts: Use unique passwords and multifactor authentication wherever possible.
• Use trusted networks: Avoid sensitive transactions on unfamiliar Wi-Fi networks; use mobile data when appropriate.
• Keep devices updated: Install operating-system, browser and security updates.
• Watch for unusual activity: Unexpected login alerts, unfamiliar transactions or repeated security warnings deserve attention.
• Secure compromised accounts: From a trusted device, change affected passwords, revoke suspicious sessions and contact the relevant service provider.
• Report financial cybercrime promptly: In India, call 1930 for urgent assistance with cyber financial fraud and report the incident through the official National Cyber Crime Reporting Portal.

If you suspect your device is compromised, disconnect it from Wi-Fi or mobile networks when appropriate, avoid deleting potential evidence and seek help from a trusted cybersecurity professional. For workplace devices, contact your organisation’s IT or security team rather than attempting your own investigation.

Emerging Technologies in Network Forensics

Modern investigations increasingly combine network monitoring with other security technologies.

• Network Detection and Response (NDR): Identifies suspicious communication patterns.
• Security Information and Event Management (SIEM): Correlates security logs across systems.
• Extended Detection and Response (XDR): Combines network, endpoint and other security signals.
• AI-assisted analytics: Helps identify anomalies and prioritise alerts.
• Threat intelligence: Connects observed indicators with known malicious infrastructure.

These technologies can accelerate investigations, but alerts must still be validated.

How Can Organisations Strengthen Network Security?

Organisations should centralise logging, synchronise system clocks, establish appropriate log-retention policies and regularly test incident-response procedures.

Network segmentation, access controls, employee awareness and continuous monitoring can reduce risk and improve visibility during investigations.

Following the Digital Trail

Network forensics helps transform scattered communication records into a clearer picture of a cyber incident.

For investigators, it can provide crucial leads. For organisations, it can reveal potential breaches. For individuals, recognising suspicious activity and responding quickly can reduce harm.

The central principle is simple: Detect suspicious activity, preserve the evidence and act before the damage spreads.

Day 12 — Network Forensics

31 Days | 31 Key Topics | October 2026

A Cybersecurity Awareness Month Knowledge Initiative

Created by Centre for Police Technology (CPT) (CPT).

Follow Centre for Police Technology (CPT) for the complete 31-Day Cybersecurity Knowledge Series.