I meant to also add that security update 2018-001 is the latest and correct 
update!
The number does not relate to the date it was released April 24, 2018

>> I have to say I was puzzled by the 2018-001 number because it is already May 
>> and there must have been previous security updates, or is that wrong?

 Ronni Brown’s iPad Pro 12.9-inch 256GB 


> On 14 May 2018, at 4:53 pm, Ronni Brown <[email protected]> wrote:
> 
> Hi Pat,
> 
> You might have installed some malware as Alan has suggested. Especially if 
> you haven’t got Firewall turned ON in your System Preferences > Security & 
> Privacy > Firewall.
> 
> 
> Go here: https://www.malwarebytes.com/pricing/?
> and download the Mac ‘Free’ version - by click on ‘DOWNLOAD NOW’
> 
> You can download the "Malwarebytes-For-Mac-User-Guide.pdf” here: 
> https://support.malwarebytes.com/docs/DOC-1883
> 
> 1. Install Malwarebytes.app version 3.3 then run a Scan by click on - 
> StartScan (which initiates a Threat Scan).
> 2. Let us know the results please.
> 
> Cheers,
> Ronni
> 
> 13-inch MacBook Air (April 2014)
> 1.7GHz Dual-Core Intel Core i7, Turbo Boost to 3.3GHz
> 8GB 1600MHz LPDDR3 SDRAM
> 512GB PCIe-based Flash Storage
> 
> macOS High Sierra 10.13.4
> 
>> On 14 May 2018, at 11:13 am, Alan Smith <[email protected]> wrote:
>> 
>> Hi Pat
>> 
>> The “genieo” malware from a few years back gave similar symptoms.  Other 
>> more knowledgeable members could perhaps give guidance on detecting and 
>> removing malware.  Perhaps worth following up.
>> 
>> Cheers
>> Alan
>> 
>>> On 14 May 2018, at 10:37 am, Pat <[email protected]> wrote:
>>> 
>>> Hi, Daniel,
>>> 
>>> Thanks for your reply, but I still haven’t been able to change away from 
>>> the pernicious Bing. Clicking on the magnifying glass does nothing. On the 
>>> Safari Preferences Search tab, trying to change Bing to anything else is 
>>> futile.  I attach a screen shot of the Safari General Preference tab.  It 
>>> differs from the screen shot that Peter Faulks sent (thanks, Peter) in that 
>>> my list does not contain a Default search engine. I am convinced that these 
>>> changes are the result of the Security 2018-001 update. I have to say I was 
>>> puzzled by the 2018-001 number because it is already May and there must 
>>> have been previous security updates, or is that wrong?
>>> 
>>> Cheers,
>>> Pat
>>> 
>>> <Screen-Shot-2018-05-14-at-09.47.17.png>
>>> 
>>>> On 13 May 2018, at 12:48, Daniel Kerr <[email protected]> wrote:
>>>> 
>>>> Another way to also change it. When you have a “blank” page open (and you 
>>>> can see the line “Search or enter website name”, if you click on the 
>>>> search magnifying glass thing to the left of this, you’ll get a drop down 
>>>> menu. You can change here.
>>>> Otherwise it’s Safari menu - Preferences - Search.
>>>> “Search engine”. Then choose from the drop down menu you want.
>>>> 
>>>> Some times websites will change the search for you (or ask you if you want 
>>>> to go to this page, without you realising it’s meaning it’s going to 
>>>> change it.
>>>> And some software can also ask if you want to change it as well, as part 
>>>> of the install of the software. Malware can also do it as well sometimes - 
>>>> though normally won’t change it to Bing, it will change it some other 
>>>> weird search engine or “tracking” website.
>>>> 
>>>> Kind regards
>>>> Daniel
>>>> 
>>>> Sent from my iPhone 7
>>>> 
>>>> ---
>>>> Daniel Kerr
>>>> MacWizardry
>>>> 
>>>> Phone: 0414 795 960
>>>> Email: <daniel AT macwizardry.com.au>
>>>> Web:   <http://www.macwizardry.com.au>
>>>> 
>>>>>> On 13 May 2018, at 11:14 am, Pat <[email protected]> wrote:
>>>>>> 
>>>>>> I have just discovered that my choice of search engine has been 
>>>>>> corrupted: I was using Duck Duck Go. And now I discover that it has been 
>>>>>> surreptitiously replaced by Bing and I haven’t been able to change it 
>>>>>> back.  I don’t like this at all!  Who  made this decision? No one asked 
>>>>>> my permission. And why can’t I change back?
>>>>>> 
>>>>>> Grrrrrrr!
>>>>>> Pat
>>>>>> Mac Pro, running OS 10.13.4
> 
> 
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