The attack, which was reported on Monday 9 January, saw an immediate shut down of the Chamber's IT systems.
The attack has not resulted in any data theft, instead the malware has 'locked down' the server meaning nothing can be accessed though the chamber remains open for business with many of its activities and events unaffected.
The attack was delivered in an email attachment which breached security system, and extended into its back-up server.
This is the first time a malware attack has broken through the chamber's cyber security, and IT specialists are working 24/7 to cleanse and remove the malware from infected computers and systems.
Simon Beardsley, chief executive at Lincolnshire Chamber of Commerce said while specialists are working to restore the IT systems, his first priority is to reassure all Chamber members and partners that no data has been stolen.
For more information please click here