They were able to reverse it immediately and the water treatment process was unaffected. A supervisor monitoring one of the systems saw a mouse pointer move across the screen and “immediately noticed the change in dosing amounts,” according to the advisory. The unknown attacker logged into TeamViewer, accessed sensitive systems and attempted to boost lye levels by 100 times. "The actor also likely used the desktop sharing software TeamViewer to gain unauthorized access to the system." “The cyber actors likely accessed the system by exploiting cybersecurity weaknesses, including poor password security and an outdated Windows 7 operating system to compromise software used to remotely manage water treatment,” according to investigators.
However, officials also said that the hacker’s attempt to boost chemicals to dangerous levels was stopped almost immediately after it started. A government advisory also revealed that the relatively unsophisticated attack used the remote-access program TeamViewer. The Oldsmar, Florida water plant hacked earlier this week used outdated Windows 7 PCs and shared passwords, the Associated Press has reported.
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