Hi! My girlfriend recently bought an android smartphone from a colleague at work. Since my gf isn't the most technically minded, I agreed to set it up for her. Since it is a Sony branded android, I installed the Sony PC Companion software that came pre-installed on the phone to update the firmware. All good, until a week later I went to uninstall the software on my machine - Avast picked up a rootkit named Sony somethingorrather.
Avast offered the option to delete it, which I selected. Avast then asked me if I wanted to run a boot-time scan, which I chose to do. The boot-time scan picked up nothing. Once it had finished, I went to the Avast log files where it stated that Avast couldn't delete the file it had found! It also had an error message appear a few times regarding the above-mentioned file.
I ran a full system scan with Avast, TDSSKiller from Kaspersky and Malwarebytes' Rootkit-scanning software - to no avail. Finally, out of desperation and paranoia, I reformatted my C: Drive and did a clean install of Win7. (hence I cannot upload avast's log - it no longer exists).
Before I did the clean install, I also tried to install Windows Defender Offline scanner onto a USB, but on my system it kept failing. I suspected that perhaps the malware wasn't letting me install it, so I went to my brother's place with a USB stick - installed first time.
I guess my questions are these:
- Have my actions been enough to remove the rootkit? If not, how can I be certain?
- My gf also installed the Sony PC Companion software, but after I had done a firmware update on the phone. Is her system also possibly infected?
- I've read on this forum that rootkits can spread from a PC to routers, and even android phones (my phone, not my gf's Sony). Are there steps I can take to check and, if required, to remove the malware from all devices?
Before someone writes this off as a false positive, please understand that the workplace as of late has been very hostile towards me and my gf, so I have very good reason to suspect that the malware was intentionally planted onto the android phone mentioned above.
My thanks in advance.