What to Do After a Cyber Attack: Recovery Guide

Labor Day weekend should mean cookouts, long weekends and a well-earned break. Unfortunately, cybercriminals don’t take holidays.

Long weekends can create opportunities for attackers because offices may be lightly staffed and unusual activity can go unnoticed longer. If employees return Tuesday morning to locked files, unavailable systems, suspicious login alerts or a ransomware message, knowing what to do after a cyber attack can make a major difference in how quickly the business recovers.

The first few hours matter. Here’s what happens next – and what your company should be prepared to do.

Step 1: Contain the Attack

First priority: stop the damage from spreading.

Compromised computers may need to be isolated from the network, malicious accounts disabled, remote sessions terminated and affected systems separated from critical infrastructure. But don’t start randomly shutting down or deleting things. Valuable forensic evidence can disappear in the process.

Your IT and cybersecurity team should follow a documented incident response process that identifies which systems are affected and determines the safest containment strategy.

Step 2: Figure Out What Happened

Once the immediate threat is contained, the investigation begins.

How did attackers get in? Was it a phishing email? Stolen credentials? An unpatched vulnerability? A compromised vendor account?

Your team also needs to determine what attackers accessed, whether information was copied or encrypted, how long they were inside the environment and whether persistence mechanisms remain.

A strong incident response checklist keeps this process organized when pressure is high.

Step 3: Protect Accounts and Credentials

If attackers obtained employee credentials, passwords may need to be reset immediately. Active sessions should be revoked, suspicious accounts investigated and multi-factor authentication verified.

Administrative accounts deserve special attention. If attackers gained elevated privileges, they may have had access to significantly more systems and information than a standard employee account would allow.

Step 4: Start the Recovery Process

After the threat has been removed, businesses can begin safely restoring operations.

For ransomware recovery, that often means rebuilding compromised devices, restoring clean backups, validating applications and carefully reconnecting systems to the network.

This is where good backups become incredibly valuable. Backups should be protected separately from production systems and tested regularly. Discovering during an emergency that your backup is corrupted, incomplete or also encrypted is not the Labor Day surprise anyone wants.

Step 5: Determine Notification Requirements

A cyberattack can create legal, regulatory, contractual and insurance obligations.

Depending on the information involved and where affected individuals are located, a company may need to notify customers, employees, insurers, regulators, law enforcement or business partners.

Cyber insurance carriers may also have specific reporting procedures. Contacting the appropriate legal counsel and insurance representatives early can help ensure required steps aren’t overlooked.

Step 6: Don’t Just Restore – Improve

Knowing what to do after a cyber attack isn’t only about getting computers working again. It’s about preventing the same attack from happening twice.

After recovery, conduct a thorough review. Patch vulnerabilities, tighten permissions, improve email security, strengthen authentication, review endpoint protection, update policies and provide additional employee cybersecurity training where needed.

Your incident response checklist should also be updated based on lessons learned during the event.

Could Your Business Handle an Attack Over Labor Day Weekend?

That’s the question every business should ask before employees head home for the holiday.

Who receives security alerts after hours? Who has authority to isolate systems? Where are your backups? Who contacts your insurance carrier? How quickly could your company begin ransomware recovery?

If nobody knows the answers without searching through emails and old documents, your response plan needs work.

Accellis Helps Businesses Prepare Before an Attack Happens

Here at Accellis, our team helps businesses strengthen cybersecurity before, during and after an incident. From managed IT and cybersecurity to network monitoring, disaster recovery, incident response and more, our team can help protect your organization and prepare it for the unexpected.

This Labor Day weekend, give your employees the break they deserve – but don’t give cybercriminals one. A prepared business can detect threats faster, respond more effectively and get back to work with significantly less disruption.