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Blackmart Alpha 0.49.93[2231].apk

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This particular notification keep popping up saying that quarantine failed and Threat Detected. I'm just curious what an .apk android does damage to our windows system?

The notification said that it's detected as PUA.Andr.Dropper.Iwfc::other.talas.

Having no idea now it just seems like an false positive report here. Hmm.. 

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You're right, an Android .apk will not harm a Windows system, as Windows can't execute an APK by itself, without an Android emulator.

However, it's common (and a bit of a courtesy) for virus scanners to detect malware for other platforms - ClamAV, the engine that powers Immunet's offline detection capabilities, wouldn't exist if this wasn't the case, as it was originally developed for Unix-like platforms at a time when viruses for these platforms were simply not observed in the wild. The ability to detect threats in .apk archives is therefore handy for people who sideload apps on to their Android devices using ADB, etc. - Just as scanning a word .doc on your BSD or Linux system helps prevent you passing an infection on to a Windows user when you send it to them.

If you don't know where the APK file is coming from, I suspect a web site is dropping it on your computer in an attempt to infect you. Most web exploits used to target Windows, but with the massive amount of Android devices now, as well as the fact that manufacturers stop releasing security-patches for them far too early, this means that there are millions of people browsing the net on insecure Android devices, which makes them a desirable and easy target, much like Windows used to be. One of the web sites you're viewing may have been compromised, (or more likely, the ad network displaying ads on it has been compromised) and it's speculatively dropping an infected apk onto your machine, in the hope you're an Android user who can get infected. Immunet rightly detects the apk and attempts to quarantine it. If the site deletes it before Immunet has had the chance to quarantine it, then quarantine will naturally fail. Also, if Immunet is your secondary protection, your primary protection might neutralise it before Immunet gets the chance, resulting in the "quarantine failed" message.

If you have downloaded the APK manually yourself, there's a good chance that the .apk file is compromised and has a trojan in it along with the legitimate program. Sometimes it's a malicious download where someone's compromised a popular app and uploaded it to one of the many download sites - and sometimes it's the developer's fault because they often bundle in telemetry and adware into apps (especially gratis ones). After e-mail, the biggest vector I've ever seen for malware-distribution is the advertising/tracking networks. You can embed an ad in your website or app one day, thinking it's clean - but the ad will be different each time it's viewed, and each time is an opportunity for a malicious ad to get displayed. The ad networks don't care so don't check their own ads before serving them. Again, this will result in a detection from Immunet and a quarantine-failure if either the file is deleted or your primary AV cleans it, before Immunet gets the chance.

It might be worth doing a full scan of your system with Immunet, and then another with your primary protection (and/or Windows Defender) to root-out anything stubborn. Don't use your computer until the full scans are all complete, and try to close anything you can that's running in the background before you do the scans (temporarily close/exit any unnecessary tray icons like Skype, your printer software, your Sat Nav updater, iTunes, and so on).

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I've just had a look at the Blackmart app description and I'm not surprised Immunet's quarantining it.

It's an unofficial app store, so contains code to download other apps - hence might have code similarities to trojan droppers. So could be a false-positive. But there are much bigger concerns with this app:

It's worth noting that Blackmart's description says it makes-available cracked versions of premium software.

I'd therefore suggest you don't use it as you're far more likely to get a virus or trojan in cracked software and the app-stores that promote such software.

Shady developers of cracked apps already have less morals, therefore are more-likely to insert malware to further their own ends. They have no problem stealing from developers, why would they suddenly develop a conscience when faced with the choice of stealing your bank details or uploading your nude selfies to porn sites? They also come into contact with other shady developers and shady apps more often, therefore are more likely to have been compromised themselves, and therefore are more likely to unknowingly be inserting malware into their apps.

I'd recommend steering clear. There's no need to ever crack an app when there's almost-always a freeware or free/open-source app with the same functionality.

Try to stick to app-stores such as F-Droid (free and open-source), UpToDown (virus-scans their apps and supplies legitimate apps), the /e/ store (legitimate apps) and Aptoide (if you stick to the verified apps and avoid cracked apps, there are a few security checks performed on them).

If it's a particular game you want to crack, or something else that you can't really find an equivalent to, make your decision: it's either worth paying-for or it's not worth playing at all.

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