Microsoft Internet Explorer PNG tRNS chuck size 1 information disclosure attempt

Question

hello, 
 I got this intrusion attempt for the first time. just don't know what to do. 
 I looked for any recent downloads and browsing history, and asked the user if he plugged any device to the computer but nothing suspicious found. 
 this is a screenshot about the intrusion,

regards,

Raphael Alganes · Answer

Hello, 
 You may refer here for details on the signature category that trigger the detection: https://docs.sophos.com/nsg/sophos-firewall/20.0/help/en-us/webhelp/onlinehelp/AdministratorHelp/IntrusionPrevention/IPSPolicies/IPSCategoryDescriptions/index.html which is file-image 
 You may check any events on the end machine AV solution for any potential detection and may also perform a full AV scan on the victim machine. 
 Regards,

Microsoft Internet Explorer PNG tRNS chuck size 1 information disclosure attempt

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