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I have a Nexus 5 phone running Android 6.0.1 (security patch level 1 Jun 2016).

It appears that over the past few days it has become infected with malware.

Periodically (every 10-15 minutes) a transparent notification appears near the bottom of the screen that looks like this (the numbers will change, and possibly the non-English text).

enter image description here

Here's what I have tried so far:

  • Installed Malwarebytes and ran a scan but it couldn't detect it.
  • Installed a few Antivirus programs (AVG, 360 Security) and it didn't find anything out of the ordinary.
  • Installed OS Monitor to see if there are any suspicious processes running or network connections open but nothing stands out.
  • Closed all running apps
  • Rebooted the phone

The notifications keep popping up. I'm a bit stuck here - this definitely looks like malware, but not sure where to go from here. Obviously a factory reset is an option, but I'd like to expore other options first.

Any recommendations about how to proceed?

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Update

After 2 days, uninstalling ES File Explorer seemed to do the trick - I'm not seeing these pop-ups anymore.


After further research this appears to be caused by an update to ES File Explorer (see this question). I have now uninstalled that app.

  • +1 for uninstall. If this is truly ES File Explorer-based, please update your answer after a few days to confirm. This would be strike 2 vs. ES File Explorer in a short time period, after their lock-screen advert incursion. Greater dispersion of this information is warranted in that case. – wbogacz Jul 10 '16 at 23:17

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