Did you just stumble upon a download or a file on your computer that is digitally signed by Ilya Kheyfets? Some of the security products refers to the detected files as Trojan.Win32.Generic!BT and W32.HfsAdware.93D4. The detection rate for the Ilya Kheyfets files collected here is 33%. Please read on for more details.
You'll typically notice Ilya Kheyfets when double-clicking to run the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the digital signature details for Ilya Kheyfets with the following procedure:
Here's a screengrab of a file digitally signed by Ilya Kheyfets:

As you can see in the screenshot above, Windows reports that "This digital signature is OK". This implies that the file has been published by Ilya Kheyfets and that the file has not been tampered with.
If you click the View Certificate button shown in the screenshot above, you can examine all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also see the address for Ilya Kheyfets, such as the street name, city and country.
StartCom Class 2 Primary Intermediate Object CA has issued the Ilya Kheyfets certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screengrab above.
The following are the Ilya Kheyfets files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 9/54 | driver_booster_setup.exe |
| 29/55 | 2598232875.exe |
| 16/57 | 1046594704.exe |
Here's the detection names for the Ilya Kheyfets files. I have grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| AVG | Generic.9EC |
| AVware | Trojan.Win32.Generic!BT |
| AegisLab | Risktool.W32.Gen!c |
| AhnLab-V3 | PUP/Win32.SystemTweaker.R176202, PUP/Win32.SystemTweaker |
| Avira | TR/IObit.wchw, TR/IObit.94856 |
| Baidu-International | PUA.MSIL.IObit.G |
| Bkav | W32.HfsAdware.93D4 |
| CAT-QuickHeal | PUA.Ilyakheyfe.Gen |
| Comodo | Application.MSIL.IObit.DA |
| Cyren | W32/S-2b5c9945!Eldorado |
| DrWeb | Program.Unwanted.856, Program.Unwanted.1316 |
| ESET-NOD32 | a variant of MSIL/IObit.G potentially unwanted, a variant of MSIL/IObit.H potentially unwanted |
| F-Prot | W32/S-2b5c9945!Eldorado |
| Fortinet | Riskware/SystemTweaker |
| Ikarus | PUA.MSIL.Iobit |
| Jiangmin | RiskTool.SystemTweaker.v, RiskTool.SystemTweaker.k |
| K7AntiVirus | Unwanted-Program ( 004d90841 ), Adware ( 004d99681 ) |
| K7GW | Unwanted-Program ( 004d90841 ), Adware ( 004d99681 ) |
| Kaspersky | not-a-virus:RiskTool.Win32.SystemTweaker.ad |
| McAfee | Artemis!96CD7817344D |
| McAfee-GW-Edition | Artemis |
| NANO-Antivirus | Riskware.Win32.SystemTweaker.ebxfsu |
| Panda | Trj/CI.A |
| Qihoo-360 | Win32/Virus.RiskTool.7e8, HEUR/QVM03.0.0000.Malware.Gen |
| SUPERAntiSpyware | PUP.SystemTweaker/Variant |
| Sophos | Generic PUA JH (PUA) |
| Symantec | Trojan.Gen.2, SAPE.Heur.92104 |
| TrendMicro | TROJ_GEN.R00XC0EEK16 |
| VIPRE | Trojan.Win32.Generic!BT |
| Yandex | Riskware.SystemTweaker! |
The detection percentage is based on that I've collected 166 scan results for the Ilya Kheyfets files. 54 of these scan results came up with some sort of detection. If you like, you can review the full details of the scan reports by examining the files listed above.
The analysis has been done on certificates with the following serial numbers: