Hi, i don't know if this is the right place to ask for my problem/concern, but if is not feel free to move to the right section (and sorry for the mistake).
So, few days ago i found on my pc an old software unused by me for at least 3 years (between the last usage and now i upgraded win 7 to win 10. i don't know if this can help or can be a problem in the diagnosis). Just for curiosity and to be sure i used virus total scanner on the .exe file of that software and the results revealed for 3 of 67 analysis scanners that there was a Riskware (0040eff71).
My reaction to this was to download ADWcleaner (because it helped me in other circustances in the past) to scan my pc. I don't have anymore the log files because i unistalled ADWcleaner (i regret this decision), but i remember the entries. ADWcleaner only found 2 suspicious results in the Registry field (*only things i don't remember are if HKEY was HKLM or HKCU):
PUP.Optional.Legacy key registry HK*/Software/Classes/Interface {ID}
PUP.Optional.Multiplug key registry HK*/Software/Classes/TypeLib {ID}
At this point i cleaned up with ADWcleaner but the PUP.Optional.Legacy came back once. I cleaned again and also this one disappeared.
After this i unistalled ADWcleaner and installed Malwarebytes 3 to make sure nothing else remained. I ran the scan and nothing has been found so i supposed the pc was correctly cleaned, but in the runtime protection of the premium trial i was reported with several venturead.com block site events during my daily navigation. I scanned again with Malwarebytes 3 and i also installed and ran Zemana, but nothing has been reported as malevolous. Looking for advise on internet, i reset the browser and the venturead.com events disappeared.
The goal of this topic is mainly to understand the tipe of infection that i faced and if i should be worried about my accounting credentials used during this long time that supposedly i was exposed. So, my questions are:
1) what kind of threats were these of mine? (i would like to understand more about every evidence i described just to learn more about this. i searched on internet but nothing was exactly my case)
2) should i be worried about my credencials? (i usually change passwords every 5, 6 month, last time 2 weeks ago, and always sign in in anonymous browser windows, but i understand that if these threats were severe, like a keylogger, these my habits are meaningless)
3) i sometimes connect my external hdd to make a backup of my personal data (mainly photos, videos and docs). I have done this several times before this episode so, my last question is: Should i be worried about my external hdd or data stored? (i don't know if this helps, but i never executed nothing on that device and i made a scan with Malwarebytes 3 after i finished my fight against the venturead.com thing)
I'm sorry for this wall of text and for my english (not so good i know) and i hope u can give me good news about my preoccupation.
PS: i forgot to say that the only real symptoms (during the infection period) i perceived were failed attempts (blocked by the browser and the adblock extension) from the browser to open popups/browser cards and, i suppose, too much ads on certain websites (too much considering that i had adblock). i don't know if i had some performance issues because this pc has 9 years old so is actually the normal behavior for me seeing lag spikes on videogames or difficulty in some tasks.