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Old 25-02-2018, 13:27   #21
Qtx
CF's Worst Nightmare
 
Join Date: May 2012
Location: Probably outside the M25
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Re: I'm worried I might've done something stupid...

Don't feel bad you fell for this, some of them are very convincing on the phone.

Once they have remote desktop they usually check which Antivirus you have running and make some decisions based on that. Some are easier to temporary disable or hide malware from than others and sometimes they even have a slightly different .exe malware that works better with a specific AV.

Sometimes they might just put a bit of loader software on which contains no malware at all but it's only job is to talk to a control centre every so often. At some point the control centre tells it to download the actual malware and run it. So until that happens, your PC might look clear from infections.

The people doing the infecting have the bonus of being able to write some malware that no antivirus vendors are aware off and on one particular day letting it off to all those people who were prepped with the loader software, meaning a better infection rate. If they got the indian call centre guys to install the malware straight away, the AV vendors would be working on signatures for that malware and push it out at the end of the week meaning no one else would get infected unless they made changes to make the malware undetected again. So having the malware downloading software ready on a thousand machines to infect in the same hour is beneficial.

But it means you might think you are clean from infection if the initial downloader isn't picked up as a nasty, which is often the case.
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