Be ready to recover from ransomware
By Ashleigh Petersen Bryce Austin
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Be ready to recover from ransomware

What to do and not do if your system is attacked

There were seven people seated around the table: The CEO, the vice president, the chief financial officer (CFO), a special agent from the FBI, the company owner, a forensics technician and the company’s chief information security officer (CISO).

“Don’t pay” was the CEO’s vote. Same for the vice president.

“Pay it” was the owner’s response. The CFO nodded in agreement.

“Paying could be a violation of federal law,” stated the FBI representative.

The CISO had a hard time getting words out, as this was the largest ransom that he had dealt with at the time. $1.2 million was a lot of money. “I don’t see another option given the status of our backups. Either we pay the ransom or we begin liquidating the assets of the company as soon as possible. Which is the lesser of two evils?” he asked.

The CISO negotiated the ransom down to $410,000. The Bitcoin took several hours to amass. The cybercriminals delivered a decryption key, but 30 percent of the company’s data was gone forever — some of their hard drives filled up during the ransomware encryption process, and the encryption software kept running after the drives couldn’t hold any more data.

Every file encrypted after that point was irretrievable. The total recovery took three months to ensure that no backdoors were left in the company’s systems, and the lawsuit to get the insurance company to cover the incident lasted almost two years.

Stopping ransomware includes three key areas: Cybersecurity hygiene of your employees, proper practices by your IT department and your data backup strategy. Here are eight ways to prevent a ransomware attack, and eight ways to recover from an attack if you fall victim to one.

Preventing a ransomware attack:

1. Add Multi-Factor Authentication (MFA) on all of your company’s email accounts and on all external access to your network. This includes the virtual private network (VPN), TeamViewer, WebEx and other tools used by the company. This will help prevent a cybercriminal from taking over an email account using a compromised username/password.

2. If your company uses Windows Active Directory, do not log in to computers with domain admin accounts. There is an attack called “pass the hash” that will steal encrypted or “hashed” credentials left behind. If you must log in with a domain admin account, change the password.

3. Patch your PCs. Do this for your workstations and servers, every month, with no exceptions. That includes conference room PCs, loaner PCs, HVAC computers, etc.

4. Patch your networking gear. This includes firewalls, switches, uninterruptible power supply systems, etc.

5. Install good antivirus software everywhere. Make sure all PCs, Macs and servers are protected.

6. Geofilter your internet traffic and emails. If you don’t do business with a foreign country, block traffic and emails to/from it. It keeps out lazy cybercriminals. No, it won’t keep out the cybercriminals that VPN into your country before attacking you, but it’s surprising how many cybercriminals don’t take the time to do that.

7. If you are part of a company with many workstations, use the Microsoft local administrator password solution (LAPS) to randomize the local administrator password on all PCs. If you have the same initial local admin username/password for every workstation, then if one machine gets compromised, it’s very easy for them to all get compromised.

8. If your users have local admin credentials, you may want to rethink that. Do this today. Right now. If a cybercriminal compromises a computer, they normally inherit the permissions of the user for that computer. If that user is a local administrator, the bad guys are going to use that access to do more damage.

In case you fall victim to ransomware, you need the following. Please note that most of these need to be done before the attack takes place:

1. Have offline backups. These are backups that are kept off of your network. Cybercriminals try to delete your backups. If your backups are not on your network, the bad guys can’t destroy them.

2. Tested restore procedures. If you try to restore your backups only when you need them, you are rolling the dice every time you are in a real bind.

3. Offline restore methodology. Don’t begin a restore with your network still attached to the internet. Ransomware cases often unfold where the cybercriminals still have hooks into a company’s network, and they destroy the used-to-be-offline backups as soon as the restore process begins.

4. Workstation reimages. You need a clean workstation image to restore workstations quickly if you suspect they have been compromised.

5. Server rebuilds. You need a clean server image to recreate your servers quickly.

6. Pre-negotiated incident response team contract. Find a cyber-incident response company and get a contract in place. That way you will know how to “call in the cavalry” very quickly as opposed to going through contract negotiations in the middle
of a crisis.

7. Keep 35 percent of free drive space on all network drives. Ransomware often bloats the data on the drives it encrypts. As soon as a drive fills up, the encryption process will keep trying to move forward, but every file it encrypts after the drive is full will be unrecoverable.

8. If you have cybersecurity liability insurance, call your insurance company as soon as possible. There are many stories of insurance policies with a clause stating that the customer must inform their insurance company of a suspected incident within 24 hours of the initial discovery. If they take a few days to confirm that the incident was real, it can be an expensive mistake.

If all companies followed the specific recommendations above, ransomware cybercriminals would become a thing of the past. With proactive action and a good cybersecurity awareness training program for your employees, cybercrime is a solvable problem.

Bryce Austin is the CEO of TCE Strategy, Minneapolis; a professional speaker on technology and cybersecurity issues; author of the book “Secure Enough? 20 Questions on Cybersecurity for Business Owners and Executives”; and actively advises companies on effective methods to mitigate cyber threats. For more information, visit bryceaustin.com.

Ashleigh Petersen

Ashleigh PetersenAshleigh Petersen

Ashleigh Petersen is the digital communications manager for Rental Management. She writes news and feature articles, plus coordinates the monthly Safety Issue and several sections in the magazine. Ashleigh loves spending time with her husband and young son, baking, gardening and listening to true crime and comedy podcasts.

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