Did you just stumble upon a download or a file on your computer that has been digitally signed by Brass Search? Some of the security products refers to the detected files as Adware.NetFilter.J and Unwanted-Program ( 004b04a01 ). The detection rate for the Brass Search files collected here is 60%. Please read on for more details.
You'll probably see Brass Search when running the file. The publisher name is displayed as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the Brass Search digital signature with the following procedure:
Here's a screencap of a file that has been signed by Brass Search:

As you can see in the screenshot above, Windows states that "This digital signature is OK". This implies that the file has been published by Brass Search and that the file has not been tampered with.
If you click the View Certificate button shown in the screencap above, you can see 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 Brass Search, such as the street name, city and country.
VeriSign Class 3 Code Signing 2010 CA has issued the Brass Search certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Brass Search files I have collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 34/57 | {10231402-bfc3-4225-8766-336eb21b81e3}gt.sys |
Here is the detection names for the Brass Search files. I've grouped the detection names by each scanner engine. Thanks to VirusTotal for the scan results.
| Scanner | Detection Names |
|---|---|
| ALYac | Adware.NetFilter.J |
| AVG | Generic.E30 |
| AVware | Trojan.Win32.Generic!BT |
| Ad-Aware | Adware.NetFilter.J |
| Agnitum | Riskware.Agent! |
| Avast | Win32:BrowseFox-HO [PUP] |
| Avira | Adware/BrowseFox.aoi |
| Baidu-International | Adware.Win64.BrowseFox.V |
| BitDefender | Adware.NetFilter.J |
| Bkav | W32.HfsAdware.8515 |
| ClamAV | Win.Adware.Netfilter-130 |
| Comodo | TrojWare.Win32.AltBrowse.IZZV |
| Cyren | W32/A-b3b70cb0!Eldorado |
| ESET-NOD32 | a variant of Win64/BrowseFox.V potentially unwanted |
| Emsisoft | Adware.NetFilter.J (B) |
| F-Prot | W32/A-b3b70cb0!Eldorado |
| F-Secure | Adware.NetFilter.J |
| GData | Adware.NetFilter.J |
| Jiangmin | AdWare/Yotoon.kp |
| K7AntiVirus | Unwanted-Program ( 004b04a01 ) |
| K7GW | Unwanted-Program ( 004b04a01 ) |
| Kaspersky | not-a-virus:AdWare.Win32.Yotoon.kam |
| McAfee | Artemis!D9427EA4AB08 |
| McAfee-GW-Edition | Artemis |
| MicroWorld-eScan | Adware.NetFilter.J |
| NANO-Antivirus | Riskware.Win32.NetFilter.dgqvkd |
| Panda | Trj/CI.A |
| Qihoo-360 | Win32/Virus.Adware.854 |
| Sophos | Generic PUA AC |
| Symantec | Trojan.Gen.2 |
| VBA32 | AdWare.Yotoon |
| VIPRE | Trojan.Win32.Generic!BT |
| Zillya | Adware.Yotoon.Win64.10 |
| nProtect | Adware.NetFilter.J |
The detection percentage is based on that I have collected 57 scan results for the Brass Search files. 34 of these scan reports came up with some sort of detection. If you like, you can view the full details of the scan reports by examining the files listed above.
The analysis is based on certificates with the following serial numbers: