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As of Sophos Exploit Prevention version 3.17.17 (release commencing June 25th 2020) all files and drivers are signed with only SHA256 (previously they were SHA1 and SHA256 signed). For more information, please follow below link.
Affected computers will have all scanning functionality disabled until the required patches are installed. Kindly apply the specific patches as mentioned here: https://community.sophos.com/kb/en-us/135671.