Hackers Breached Colonial Pipeline Using Compromised Password (bloomberg.com) 112
The account's password has since been discovered inside a batch of leaked passwords on the dark web. That means a Colonial employee may have used the same password on another account that was previously hacked, he said. However, Carmakal said he isn't certain that's how hackers obtained the password, and he said investigators may never know for certain how the credential was obtained. The VPN account, which has since been deactivated, didn't use multifactor authentication, a basic cybersecurity tool, allowing the hackers to breach Colonial's network using just a compromised username and password. It's not known how the hackers obtained the correct username or if they were able to determine it on their own. "We did a pretty exhaustive search of the environment to try and determine how they actually got those credentials," Carmakal said. "We don't see any evidence of phishing for the employee whose credentials were used. We have not seen any other evidence of attacker activity before April 29."
A little more than one week later, on May 7, an employee in Colonial's control room saw a ransom note demanding cryptocurrency appear on a computer just before 5 a.m. The employee notified an operations supervisor who immediately began to start the process of shutting down the pipeline, Colonial Chief Executive Officer Joseph Blount said in an interview. By 6:10 a.m., the entire pipeline had been shut down, Blount said. It was the first time Colonial had shut down the entirety of its gasoline pipeline system in its 57-year history, Blount said. "We had no choice at that point," he said. "It was absolutely the right thing to do. At that time, we had no idea who was attacking us or what their motives were."