This is just a guess on my part, but these Trojan.Backdoor Activity detections sometimes occur when you have unknowingly been infected with a cryptocurrency miner. The Symantec / Broadcom description for System Infected: Trojan.Backdoor Activity 690 is very generic and provides few details. The NPE is a very aggressive scanner and there is a warning on the NPE home page at that states in part "Because Norton Power Eraser is an aggressive virus removal tool, it may mark a legitimate program for removal."ĭell Inspiron 5584 * 64-bit Win 10 Pro v21H2 build 19044.1889 * Firefox v104.0.0 * Microsoft Defender v.7-0.2 * Malwarebytes Premium v4.5.13.208- * Macrium Reflect Free v NOTE: Please see my comments about the Norton Power Eraser (NPE). that might be detected by Malwarebytes that I actually want to keep.Ĭlick the blue Scan button in the main interface to run a standard Threat Scan, the recommended scan method that searches the most common system locations for higher-risk malware as well as lower-risk PUPs and PUMs. I also have Malwarebytes configured to warn me before it removes any PUPs or PUMs at Settings (gear icon) | Security | Potentially Unwanted Items so I have a chance to review any lower-risk threats like browser toolbars, etc. If you haven’t used Malwarebytes before I generally recommend that users deactivate the 14-trial trial of the Premium features after installation at Settings (gear icon) | Account | Deactivate (see Deactivate Premium Trial in Malwarebytes for Windows) and just use Malwarebytes Free as a second-opinion on-demand scanner. I’d suggest running a second-opinion scan with Malwarebytes Free for Windows v4.x ( since you have Win 7 SP1 or higher users with Win XP and Vista should go to to download the legacy Malwarebytes v3.5.1 for these older operating systems) to see if this scanner can find malware or a PUP (potentially unwanted program like adware, unwanted browser toolbars, etc.) or PUM (potentially unwanted registry modification) that might have been missed by your Norton antivirus. What is your default browser, and can you tell by the time stamp of these logged alerts if this block occurs when your browser is open and/or if you visit a specific web site?
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